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Quizzes > Science > Chemistry

Think You Know Elements 11-20? Take the Quiz!

Test Yourself with the Periodic Table Test 1-20

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art periodic table quiz design highlighting elements 1-20 on golden yellow background

Ready to master the building blocks of matter? Take our free quiz on first 20 elements and prove you know the essentials of chemistry! This fun periodic table test 1 20 will challenge your recall of each element's name, symbol, and atomic number - from hydrogen up through calcium. Curious about the trickier 11-20 elements on the periodic table? Dive in, set a personal best, then see if you can nail atomic number 20 . Don't wait - start this first 20 elements of the periodic table quiz now to level up your element expertise, and when you're ready for more, try our first 40 elements quiz !

What is the atomic number of Hydrogen?
2
8
1
6
Hydrogen is the first element on the periodic table and has one proton in its nucleus, giving it an atomic number of 1. This atomic number uniquely identifies the element. Every hydrogen atom has exactly one proton, distinguishing it from all other elements. More info
What is the atomic number of Helium?
8
1
10
2
Helium has two protons in its nucleus, which gives it the atomic number 2 on the periodic table. It is the second element and the first noble gas. Its stable configuration arises from having filled 1s orbitals. More info
What is the atomic number of Oxygen?
6
8
10
7
Oxygen has eight protons in its nucleus, placing it at atomic number 8 on the periodic table. This configuration leads to a 1s²2s²2p? electron arrangement. Oxygen's atomic number defines its chemical identity and reactivity. More info
Which element has the atomic number 6?
Carbon
Oxygen
Boron
Nitrogen
Carbon has six protons in its nucleus, giving it the atomic number 6. This element forms the basis of organic chemistry due to its ability to form four covalent bonds. Its position in period 2 and group 14 reflects its electron configuration. More info
What is the atomic number of Neon?
12
14
10
8
Neon is the tenth element on the periodic table, with ten protons in its nucleus, giving it an atomic number of 10. It is a noble gas with a full outer electron shell. Its inert nature is due to this stable configuration. More info
Which element has the atomic number 12?
Aluminium
Sodium
Silicon
Magnesium
Magnesium has twelve protons in its nucleus, making its atomic number 12. It is an alkaline earth metal found in group 2. Magnesium's electron configuration ends in 3s². More info
What is the atomic number of Calcium?
16
20
22
18
Calcium has twenty protons in its nucleus, so its atomic number is 20. It resides in group 2 as an alkaline earth metal. Calcium is essential for biological processes like bone formation. More info
Which element has the atomic number 3?
Lithium
Potassium
Sodium
Beryllium
Lithium has three protons in its nucleus, giving it an atomic number of 3. It is the lightest metal and the first element in group 1 (alkali metals). Lithium's small atomic size and reactivity are well documented. More info
Which noble gas has the atomic number 18?
Xenon
Argon
Krypton
Neon
Argon has eighteen protons, making its atomic number 18, and it is a noble gas in group 18. Its inert properties come from a fully filled electron shell (3s²3p?). Argon constitutes about 1% of Earth's atmosphere. More info
Which element has the atomic number 14?
Aluminium
Silicon
Phosphorus
Magnesium
Silicon has fourteen protons in its nucleus, giving it atomic number 14. It is a metalloid in group 14 and period 3. Silicon's widespread use in semiconductors stems from its electronic properties. More info
Which alkali metal has the atomic number 11?
Lithium
Potassium
Sodium
Rubidium
Sodium has eleven protons, so its atomic number is 11, placing it in the alkali metal group (group 1). It is highly reactive and important in biological functions. More info
What is the atomic number of Sulfur?
16
17
15
14
Sulfur has sixteen protons in its nucleus, so its atomic number is 16. It is a nonmetal in group 16 with multiple allotropes. Sulfur's role in amino acids makes it vital in biology. More info
Which alkaline earth metal has the atomic number 4?
Beryllium
Magnesium
Strontium
Calcium
Beryllium has four protons in its nucleus, giving it atomic number 4. It is the lightest alkaline earth metal in group 2 and period 2. Beryllium's high stiffness and low density make it unique. More info
Which metalloid has the atomic number 5?
Aluminium
Boron
Silicon
Carbon
Boron has five protons, so its atomic number is 5. It is classified as a metalloid and sits in group 13, period 2. Boron's applications include borosilicate glass and detergents. More info
Which halogen has the atomic number 17?
Chlorine
Fluorine
Bromine
Iodine
Chlorine has seventeen protons, making its atomic number 17, and is part of the halogen group in period 3. Its high reactivity is due to one unpaired electron in the p orbital. Chlorine is widely used in water treatment. More info
Among the first 20 elements, which has the smallest atomic radius?
Fluorine
Hydrogen
Helium
Neon
Helium has the smallest atomic radius because it has only one electron shell and a high effective nuclear charge due to its two protons. Atoms with more protons pull their shells closer, reducing their size. Among the first 20, helium's closed-shell configuration yields the smallest radius. More info
Which element in the first 20 has the highest first ionization energy?
Oxygen
Neon
Helium
Fluorine
Helium exhibits the highest first ionization energy in the first 20 elements due to its small size and high effective nuclear charge. Removing an electron from its full 1s shell requires significant energy. Noble gases generally have high ionization energies because of stable electron configurations. More info
Which element among the first 20 has the highest electronegativity?
Oxygen
Chlorine
Fluorine
Nitrogen
Fluorine is the most electronegative element on the Pauling scale due to its high effective nuclear charge and small atomic radius. It strongly attracts bonding electrons. This makes it extremely reactive, especially with metals. More info
What is the ground-state electron configuration of Magnesium?
[Ne] 3s¹
[He] 2s²2p?3s²3p¹
[Ar] 4s²
[Ne] 3s²
Magnesium has twelve electrons, filling the configuration up to neon ([Ne]) and then two electrons in the 3s orbital, giving [Ne] 3s². This reflects its position in period 3 and group 2. The filled 3s subshell contributes to its chemistry as an alkaline earth metal. More info
Which element in period 2 is classified as a metalloid?
Beryllium
Silicon
Boron
Carbon
Boron is the only element in period 2 considered a metalloid, exhibiting properties between metals and nonmetals. It sits in group 13 and has intermediate electrical conductivity. Boron's classification stems from its semiconducting behavior. More info
Which element among the first 20 commonly exhibits a +4 oxidation state?
Nitrogen
Oxygen
Carbon
Sodium
Carbon forms a +4 oxidation state in compounds like CO? because it can share or lose four electrons to achieve a noble gas configuration. It also shows +2 in some compounds but +4 is common in organic and inorganic chemistry. This behavior is rooted in its four valence electrons. More info
Which of the first 20 elements has the lowest melting point?
Fluorine
Helium
Neon
Hydrogen
Helium has the lowest melting point of all elements because its atoms interact only through very weak van der Waals forces. It remains liquid down to absolute zero at standard pressure. Its quantum properties also prevent solidification without applied pressure. More info
Which of the first 20 elements has only one stable isotope?
Nitrogen
Fluorine
Sodium
Neon
Fluorine has only one stable isotope, ¹?F, making it unique among the first 20 elements. Other elements like carbon and oxygen have multiple stable isotopes. This single-isotope nature simplifies its isotopic studies. More info
Which first 20 element has a ground-state electron configuration ending in 2p³?
Nitrogen
Phosphorus
Oxygen
Boron
Nitrogen's seven electrons fill the configuration [He] 2s² 2p³, ending in 2p³. This half-filled p subshell provides extra stability. Phosphorus also has p³ but in the 3p subshell, not 2p. More info
Which element is the least abundant in Earth's crust among the first 20?
Hydrogen
Beryllium
Lithium
Neon
Lithium is the rarest of the first 20 elements in Earth's crust, with an average abundance of about 20 parts per million. Hydrogen occurs in water and minerals, making it more abundant in crustal materials. Beryllium and neon are more common in certain minerals and the atmosphere, respectively. More info
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Study Outcomes

  1. Identify Atomic Numbers -

    Correctly match each element with its atomic number from hydrogen through calcium, reinforcing core periodic table fundamentals.

  2. Recall Element Names and Symbols -

    Retrieve element names and chemical symbols for elements 1 - 20 with confidence, ensuring precise answers in the periodic table test 1 20.

  3. Distinguish Elements 11 - 20 -

    Differentiate transition and post-transition metals by their atomic numbers and symbols in the quiz on first 20 elements.

  4. Apply Atomic Number Knowledge -

    Use your understanding of atomic numbers to solve timed quiz scenarios, improving both speed and accuracy.

  5. Analyze Periodic Trends -

    Examine how atomic number progression relates to periodic properties like radius and reactivity for deeper insight.

  6. Enhance Memory Retention -

    Implement quiz-based techniques to solidify long-term recall of the first 20 elements and their key characteristics.

Cheat Sheet

  1. Understanding Atomic Numbers -

    The atomic number (Z) equals the number of protons in an element's nucleus and uniquely identifies it - crucial for any quiz on first 20 elements. For example, element 11 (Na) has 11 protons and, in neutral form, 11 electrons. According to IUPAC and MIT OpenCourseWare, mastering Z values ensures you'll never mix up elements on a periodic table test 1 20.

  2. Electron Configurations up to Calcium -

    Elements 1 - 20 fill the 1s, 2s, 2p, 3s, 3p and 4s orbitals sequentially, following the Aufbau principle taught in university chemistry courses. For instance, Magnesium (Z=12) is 1s² 2s² 2p❶ 3s², and Calcium (Z=20) adds 4s². Practice writing these to boost confidence before tackling 11-20 elements on the periodic table.

  3. Group and Block Classifications -

    Knowing blocks (s- and p-) and groups (e.g., alkali metals in Group 1, halogens in Group 17, noble gases in Group 18) helps predict behavior. Elements 11 - 20 fall in the 3s/3p blocks: Na, Mg (3s) and Al, Si, P, S, Cl, Ar (3p). University of California chemistry guides highlight that grouping aids quick recall during your periodic table test 1 20.

  4. Periodic Trends: Radius and Ionization Energy -

    Across a period, atomic radius generally decreases while ionization energy increases - key patterns from Li→Ne or Na→Ar. For example, chlorine (Z=17) has a smaller radius and higher ionization energy than sodium (Z=11). Recognizing these trends, as detailed in ACS publications, will ensure you ace any quiz on first 20 elements.

  5. Mnemonic Devices for First 20 Elements -

    Create a memorable phrase like "Happy Henry Likes Beans Brown, Clean New Ovens…", covering H through Ne, then extend for 11 - 20 (Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca) with "Naughty Monkeys Always Sing Pretty Songs…" to cement order. Research from educational journals shows mnemonics boost retention by up to 40%. Try writing and reciting your own to conquer 11-20 elements on the periodic table.

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