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Periodic Table Compounds Quiz: Can You Master the Elements?

Dive into the periodic table of compounds and test your skills!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper cut style periodic table shapes and molecule models on coral background for elements and compounds quiz challenge.

Ready to put your periodic table compounds knowledge to the test? In this engaging periodic table compounds quiz, you'll explore the building blocks of matter, from simple molecules to complex mixtures. Discover the ultimate periodic table of compounds and see how each element plays its part. Perfect for chemistry students, hobbyists, and curious minds, you'll learn how elements combine while you tackle fun timed challenges in our interactive periodic table with compounds format. Dive into periodic table trivia or tackle tricky questions about elements to see how well you know the periodic table and compounds. Start your challenge and boost your elemental IQ!

What is the chemical symbol for sodium?
Nm
S
Na
So
The chemical symbol for sodium is Na, derived from its Latin name 'natrium'. It is used internationally to represent sodium in chemical formulas and equations. Sodium is an alkali metal in Group 1 of the periodic table. Learn more
What is the atomic number of oxygen?
16
8
7
6
Oxygen has an atomic number of 8, which indicates it has eight protons in its nucleus. This places oxygen in Period 2 and Group 16 of the periodic table. Atomic number is a fundamental property that defines each element. Learn more
What is the chemical formula for water?
HO2
OH2
H2O2
H2O
Water is composed of two hydrogen atoms bonded to one oxygen atom, giving the formula H?O. This simple molecule is essential for life and exhibits hydrogen bonding. The molecular structure leads to many of water's unique physical properties. Learn more
Which element is represented by the symbol Fe?
Iron
Francium
Einsteinium
Fluorine
The symbol Fe comes from the Latin name 'ferrum', which means iron. Iron is a transition metal in Group 8 of the periodic table and is widely used in construction and manufacturing. The Latin origin explains the difference between symbol and English name. Learn more
What is the formula of table salt?
Na2CO3
CaCO3
KCl
NaCl
Table salt is sodium chloride, with the chemical formula NaCl. It consists of sodium cations (Na?) and chloride anions (Cl?) in a 1:1 ratio. Salt is an ionic compound that forms a crystalline solid structure. Learn more
Which noble gas has atomic number 10?
Neon
Krypton
Helium
Argon
Neon has atomic number 10 and is a noble gas in Group 18. It is colorless, odorless, and inert under most conditions. Noble gases have complete valence electron shells, making them very stable and unreactive. Learn more
Which element has the highest electronegativity?
Fluorine
Oxygen
Chlorine
Nitrogen
Fluorine is the most electronegative element with a Pauling scale value of 3.98. High electronegativity means an atom strongly attracts electrons in a chemical bond. This property makes fluorine highly reactive, especially with metals and organic compounds. Learn more
What is the most abundant element in the Earth's atmosphere?
Oxygen
Nitrogen
Argon
Carbon Dioxide
Nitrogen makes up about 78% of the Earth's atmosphere by volume. Oxygen is the second most abundant at around 21%. The remaining gases include argon, carbon dioxide, and trace gases. Nitrogen's abundance influences many biological and chemical processes. Learn more
Which element is a halogen?
Argon
Oxygen
Chlorine
Neon
Chlorine is a halogen in Group 17 of the periodic table, known for its high reactivity and diatomic molecular form (Cl?). Halogens have seven valence electrons and readily gain one electron to form anions. They are used in disinfection and manufacturing processes. Learn more
Which group of elements is known for being inert?
Alkali metals
Halogens
Alkaline earth metals
Noble gases
Noble gases, found in Group 18 of the periodic table, are inert due to their full valence electron shells. This electronic configuration makes them very stable and unreactive under standard conditions. Common noble gases include helium, neon, and argon. Learn more
What is the chemical symbol for potassium?
Po
P
K
Pt
Potassium uses the symbol K, derived from the Latin name 'kalium'. It is an alkali metal in Group 1 and is highly reactive, especially with water. Potassium compounds are essential in biological processes like nerve function. Learn more
What is the chemical formula for calcium carbonate?
CaCO3
CaC3O3
CaCO2
Ca2CO3
Calcium carbonate has the formula CaCO?, consisting of calcium cations and carbonate anions. It is the main component of limestone, marble, and shells. This compound reacts with acids to produce carbon dioxide gas. Learn more
Which compound is ionic?
CH4
HCl
CO2
MgO
Magnesium oxide (MgO) is an ionic compound formed by Mg²? and O²? ions. Ionic compounds typically form between metals and nonmetals with large electronegativity differences. CO?, HCl, and CH? are covalent compounds. Learn more
Which element has the lowest first ionization energy?
Sodium
Lithium
Cesium
Potassium
Cesium has the lowest first ionization energy due to its large atomic radius and electron shielding. This makes it easier to remove the outermost electron. Ionization energy decreases down a group on the periodic table. Learn more
What is the oxidation state of sulfur in SO2?
+4
-2
+6
+2
In SO?, each oxygen has an oxidation state of -2. Summing two oxygens gives -4, so sulfur must be +4 to balance the molecule's neutral charge. Oxidation states help track electron transfer in reactions. Learn more
What is the molecular shape of methane (CH4)?
Tetrahedral
Linear
Bent
Trigonal planar
Methane has four bonds arranged symmetrically around the carbon atom, giving a tetrahedral shape. VSEPR theory predicts this geometry to minimize electron pair repulsion. The bond angles are approximately 109.5°. Learn more
Which alkali metal is most reactive with water under standard conditions?
Potassium
Sodium
Lithium
Rubidium
While reactivity increases down the group, potassium reacts more vigorously with water than sodium under standard conditions of pressure and temperature. Rubidium and cesium are more reactive but often tested less due to their rarity and radioactivity. Learn more
What is the chemical formula for ammonia?
NH4
NH3
N2H4
NH2
Ammonia consists of one nitrogen atom bonded to three hydrogen atoms and has the formula NH?. It is a common weak base and is widely used in fertilizers. The molecule has a trigonal pyramidal shape due to a lone pair on nitrogen. Learn more
Which element is classified as a metalloid?
Phosphorus
Silicon
Neon
Aluminum
Silicon exhibits properties intermediate between metals and nonmetals, classifying it as a metalloid. It is a semiconductor and forms covalent bonds. Metalloids are found along the staircase line on the periodic table. Learn more
What type of bond is found in molecular oxygen (O2)?
Nonpolar covalent
Ionic
Metallic
Polar covalent
O? consists of two oxygen atoms sharing a pair of electrons equally, forming a nonpolar covalent bond. Both atoms have the same electronegativity, so electron density is evenly distributed. This bond type is characteristic of diatomic molecules like N? and H?. Learn more
Which compound features a triple bond between its atoms?
Carbon dioxide (CO2)
Oxygen gas (O2)
Hydrogen gas (H2)
Nitrogen gas (N2)
Nitrogen gas (N?) has a triple bond between the two nitrogen atoms, making it very stable and difficult to break. This bond consists of one sigma and two pi bonds. Triple bonds are stronger and shorter than double or single bonds. Learn more
What is the IUPAC name for Fe2O3?
Iron(II) oxide
Diiron trioxide
Ferric oxide
Iron(III) oxide
Fe?O? is named iron(III) oxide according to IUPAC rules, indicating iron has a +3 oxidation state. 'Ferric oxide' is a common older name but not fully systematic. Iron(II) oxide is FeO, so that name is incorrect. Learn more
Which of these oxides is amphoteric?
Al2O3
CO2
SO3
Na2O
Aluminum oxide (Al?O?) behaves as an amphoteric oxide, reacting with both acids and bases. Acidic oxides like SO? react only with bases, while basic oxides like Na?O react only with acids. Amphoteric oxides can act as either, depending on the conditions. Learn more
Lattice energy is primarily a measure of what?
Hydrogen bonding
Ionic bond strength
Covalent bond length
Metallic bonding
Lattice energy quantifies the strength of ionic bonds in a crystalline lattice, defined as the energy released when ions combine to form a solid. Higher lattice energy indicates stronger ionic interactions. It depends on ionic charge and distance between ions. Learn more
Which element has the highest melting point?
Tungsten
Carbon
Osmium
Iron
Carbon, in its diamond allotrope, has the highest melting (sublimation) point of any element, above 3550 °C. Tungsten's melting point is slightly lower at 3422 °C. Diamond's strong covalent network explains its extreme stability at high temperatures. Learn more
What is the empirical formula for a compound containing 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?
C2H2O
CHO
CH2O
C2H4O2
Converting percentages to moles (C?3.33, H?6.63, O?3.33) and dividing by the smallest gives a ratio of C:H:O = 1:2:1, so the empirical formula is CH?O. This represents simplest whole-number ratios of atoms. Learn more
What is the IUPAC name for CuSO4·5H2O?
Copper sulfate hydrate
Copper(I) sulfate pentahydrate
Copper(II) sulfate pentahydrate
Cupric sulfate pentaoxide
CuSO?·5H?O is named copper(II) sulfate pentahydrate, indicating copper's +2 oxidation state and five water molecules. Hydrate nomenclature uses prefixes to denote water count. Copper(I) sulfate would have Cu+, not applicable here. Learn more
Which acid is diprotic?
H2SO4
HNO3
H3PO4
HCl
Sulfuric acid (H?SO?) is diprotic, meaning it can donate two protons (H?) in successive steps. HCl and HNO? are monoprotic (one proton), while H?PO? is triprotic. Acid classification depends on the number of ionizable hydrogen atoms. Learn more
What is the hybridization of the carbon atoms in ethene (C2H4)?
sp3d
sp2
sp3
sp
In ethene (C?H?), each carbon forms three sigma bonds (two C - H and one C - C) and one pi bond, giving sp² hybridization. The unhybridized p orbitals overlap to form the pi bond. This planar geometry has 120° bond angles. Learn more
What is the oxidation state of chromium in potassium dichromate (K2Cr2O7)?
+2
+3
+6
+4
In K?Cr?O?, potassium is +1 and oxygen is -2. Total charge of dichromate anion is -2, so 2 Cr must sum to +12 (so each Cr is +6). This explains chromium's +6 oxidation state in dichromate. Learn more
Which element exhibits allotropy at room temperature?
Calcium
Aluminum
Phosphorus
Sodium
Phosphorus exhibits allotropy with white, red, violet, and black forms, each having different structures and properties. Allotropy refers to the existence of an element in more than one form. Calcium, sodium, and aluminum do not show allotropy under standard conditions. Learn more
What is the VSEPR shape of SF6?
T-shaped
Trigonal bipyramidal
Octahedral
Square planar
SF? has six bonding pairs and no lone pairs on sulfur, resulting in an octahedral geometry. VSEPR theory predicts bond angles of 90° and 180° in this shape. Sulfur expands its octet to accommodate twelve electrons. Learn more
Which of the following is a chelating ligand?
Ethylenediamine
Water
Ammonia
Carbon monoxide
Ethylenediamine is a bidentate ligand that can bind to a metal at two sites, forming a chelate ring. Chelating ligands stabilize metal complexes more than monodentate ligands like ammonia or water. CO is also monodentate. Learn more
Which mineral identification technique uses diffraction of X-rays by crystal lattices?
Infrared spectroscopy
X-ray diffraction
NMR spectroscopy
Mass spectrometry
X-ray diffraction (XRD) analyzes the pattern produced when X-rays interact with a crystal lattice, revealing the structure of minerals and compounds. Infrared, NMR, and mass spectrometry provide different types of molecular and elemental information. XRD is the primary method for solid-state structure determination. Learn more
In molecular orbital theory of O2, which antibonding orbital has the highest energy?
?*2p
?2p
?*2p
?2p
In O?, the ?*2p antibonding orbital lies at higher energy than the ?*2p orbitals due to its orientation along the internuclear axis, which leads to greater antibonding interaction. Molecular orbital diagrams of diatomics illustrate this ordering. Learn more
What is the point group symmetry of staggered ferrocene?
D10h
D5h
D5d
D5
Staggered ferrocene has D?d symmetry, featuring a fivefold rotational axis and perpendicular C? axes. The cyclopentadienyl rings are staggered, giving enhanced symmetry. This symmetry influences its spectroscopic and electronic properties. Learn more
Which technique is most suitable for determining the crystal structure of a transition metal oxide?
Infrared spectroscopy
X-ray diffraction
Mass spectrometry
Nuclear magnetic resonance
X-ray diffraction (XRD) is the foremost method for elucidating crystal structures of solid materials, including transition metal oxides. It provides atomic-level information on lattice parameters and atomic positions. Other techniques analyze bonds or masses but not complete 3D structures. Learn more
What is the magnetic property of an octahedral Ni2+ complex in a weak ligand field?
Diamagnetic
Ferromagnetic
Antiferromagnetic
Paramagnetic with two unpaired electrons
In a weak field, octahedral Ni²? (d?) complexes have the electronic configuration t?g?e_g², resulting in two unpaired electrons and paramagnetism. Strong fields could pair electrons differently but weak fields produce high-spin configurations. Learn more
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Study Outcomes

  1. Identify Element Symbols -

    Apply your knowledge of the periodic table to correctly recognize element symbols and atomic numbers within various compounds.

  2. Differentiate Compound Types -

    Distinguish between ionic and covalent periodic table compounds by evaluating bonding characteristics and chemical composition.

  3. Interpret Chemical Formulas -

    Analyze molecular formulas to determine the ratio and type of elements in compounds displayed in the quiz.

  4. Classify Compounds by Groups -

    Categorize compounds according to periodic table groups and predict properties based on their positions.

  5. Recall Periodic Table Trends -

    Understand and recall trends such as electronegativity and atomic radius to explain compound behavior.

  6. Apply Quiz Strategies -

    Use insights from the periodic table of compounds to maximize your score and reinforce learning through scored trivia.

Cheat Sheet

  1. Element Identification and Symbols -

    Mastering the periodic table compounds begins with knowing each element's symbol and atomic number - for example, Fe is iron with atomic number 26. This foundational skill, emphasized by sources like MIT OpenCourseWare, ensures you can quickly reference elements when balancing equations or naming compounds. Think of it as your chemical shorthand for every periodic table of compounds challenge.

  2. Ionic vs. Covalent Bonding -

    Understanding the difference between ionic compounds (like NaCl) and covalent compounds (like H₂O) is key when tackling the periodic table with compounds. Ionic bonds form between metals and nonmetals via electron transfer, while covalent bonds share electrons, as detailed by the Royal Society of Chemistry. Practicing by classifying a list of compounds will build confidence fast!

  3. Writing and Balancing Formulas -

    Use the crossover method for ionic formulas - swap charges of Ca²❺ and SO₄²❻ to get CaSO₄ - and apply stoichiometry rules to balance equations, following guidelines from Khan Academy. For covalent compounds, remember prefixes (mono-, di-, tri-) to denote atom counts, as in CO₂ or PCl₅. Regular drills with random element pairs will sharpen your skills in any periodic table and compounds quiz.

  4. Periodic Trends and Compound Properties -

    Electronegativity increases across a period while atomic radius decreases, which influences bond polarity in compounds - concepts covered in depth by University of California resources. Recognizing these trends helps predict whether a compound will be more ionic or covalent and its reactivity. Visualizing trends on the periodic table of compounds can turn pattern recognition into your secret weapon.

  5. Memorizing Polyatomic Ions with Mnemonics -

    Polyatomic ions like NO₃❻ (nitrate) and SO₄²❻ (sulfate) are frequent quiz targets; use "Nick the Camel ate a Clam for Supper in Phoenix" to recall charge-counts. Official IUPAC tables list dozens more, but starting with the top ten gives you 80% of common ions. This fun mnemonic technique from educational journals makes mastering periodic table compounds both easy and memorable.

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