Atomic Numbers Of The First 20 Elements In The Periodic Table Quiz

Reviewed by Zohra Sattar Waxali
Zohra Sattar Waxali, PhD (Chemistry) |
Chemistry
Review Board Member
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products.
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  • 1/20 Questions

    What is the atomic number of Hydrogen?

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About This Quiz

Welcome to our Atomic Number Quiz, where you can challenge your understanding of the fundamental building blocks of matter – the first 20 elements on the periodic table. If you're intrigued by chemistry and eager to test your knowledge, this quiz is the perfect opportunity. Dive into the world of atomic numbers and discover the sequence in which these elements are arranged. From hydrogen to calcium, each element has a unique atomic number that defines its identity. This quiz will put your memory and comprehension to the test as you identify the correct atomic numbers for each of these elements. Understanding atomic numbers is crucial, as they determine an element's placement in the periodic table and offer insights into its properties. This quiz is designed to help you reinforce your knowledge of these essential concepts.

Challenge yourself and others, compare scores, and gain a deeper appreciation for the sequence of elements in the periodic table. Whether you're a chemistry enthusiast, a student, or just curious about the fundamental elements of the universe, this quiz offers a fun and educational way to explore the periodic table. Embark on this atomic journey and broaden your understanding of the chemical world around you. Are you ready to take the atomic number quiz and become a periodic table pro? Start now!

Atomic Numbers Of The First 20 Elements In The Periodic Table Quiz - Quiz

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  • 2. 

    What is the atomic number of Lithium?

    Explanation
    The atomic number for an element represents the number of protons in its nucleus. In the case of Lithium, the atomic number is 3, which means that it has 3 protons in its nucleus. This also corresponds to the number of electrons in a neutral atom of Lithium. Therefore, the correct answer is 3.

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  • 3. 

    What is the atomic number of Boron?

    Explanation
    The atomic number for an element represents the number of protons in the nucleus of an atom of that element. In the case of Boron, its atomic number is 5, which means that a Boron atom has 5 protons in its nucleus.

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  • 4. 

    What is the atomic number of Oxygen?

    Explanation
    The atomic number of an element represents the number of protons in the nucleus of its atom. In the case of oxygen, the atomic number is 8, which means that an oxygen atom has 8 protons. This number is unique to oxygen and distinguishes it from other elements on the periodic table.

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  • 5. 

    What is the atomic number of  Neon?

    Explanation
    The atomic number for Neon is 10. The atomic number represents the number of protons in the nucleus of an atom. Since Neon has 10 protons, its atomic number is 10.

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  • 6. 

    What is the atomic number of Beryllium?

    Explanation
    The atomic number for Beryllium is 4. The atomic number represents the number of protons in the nucleus of an atom. Beryllium has 4 protons, which is why its atomic number is 4.

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  • 7. 

    What is the atomic number of Carbon?

    Explanation
    The atomic number for Carbon is 6. This means that Carbon has 6 protons in its nucleus. The atomic number determines the element's position on the periodic table and its chemical properties.

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  • 8. 

    What is the atomic number of Nitrogen?

    Explanation
    The atomic number for an element represents the number of protons in the nucleus of its atom. In the case of Nitrogen, the atomic number is 7, which means that a Nitrogen atom has 7 protons.

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  • 9. 

    What is the atomic number of Fluorine?

    Explanation
    The atomic number of an element represents the number of protons in the nucleus of its atom. In the case of Fluorine, the atomic number is 9, indicating that it has 9 protons. This also means that Fluorine has 9 electrons, as the number of protons and electrons in an atom is equal in a neutral atom.

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  • 10. 

    What is the atomic number of Calcium?

    Explanation
    The atomic number for an element represents the number of protons in the nucleus of its atoms. In the case of calcium, the atomic number is 20, indicating that each calcium atom has 20 protons. This number is unique to calcium and allows it to be identified as a specific element on the periodic table.

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  • 11. 

    What is the atomic number of Sodium?

    Explanation
    The atomic number for an element represents the number of protons in the nucleus of an atom. In the case of sodium, the atomic number is 11, which means that a sodium atom has 11 protons. This number defines sodium's position in the periodic table and its chemical properties.

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  • 12. 

    What is the atomic number of Aluminum?

    Explanation
    The atomic number of an element represents the number of protons in the nucleus of its atom. In the case of aluminum, the atomic number is 13, which means that an aluminum atom has 13 protons in its nucleus.

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  • 13. 

    What is the atomic number of Magnesium?

    Explanation
    The atomic number for an element represents the number of protons in the nucleus of each atom of that element. In the case of Magnesium, the atomic number is 12, which means that each atom of Magnesium has 12 protons in its nucleus.

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  • 14. 

    What is the atomic number of Potassium?

    Explanation
    The atomic number of an element represents the number of protons in the nucleus of an atom. In the case of potassium, the atomic number is 19, which means that a potassium atom has 19 protons.

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  • 15. 

    What is the atomic number of Argon?

    Explanation
    The atomic number for Argon is 18. The atomic number represents the number of protons in the nucleus of an atom. Argon is a noble gas and is located in the 18th group of the periodic table.

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  • 16. 

    What is the atomic number of Chlorine?

    Explanation
    The atomic number for an element represents the number of protons in the nucleus of its atom. In the case of Chlorine, the atomic number is 17, which means that a Chlorine atom has 17 protons in its nucleus.

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  • 17. 

    What is the atomic number of Phosphorus?

    Explanation
    The atomic number for Phosphorus is 15. The atomic number represents the number of protons in the nucleus of an atom. Since Phosphorus has 15 protons, its atomic number is 15.

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  • 18. 

    What is the atomic number of Sulfur?

    Explanation
    The atomic number for an element represents the number of protons in the nucleus of its atoms. In the case of sulfur, the atomic number is 16, which means that each sulfur atom has 16 protons.

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  • 19. 

    What is the atomic number of Silicon?

    Explanation
    The atomic number of an element represents the number of protons in the nucleus of its atoms. In the case of Silicon, its atomic number is 14, which means that each Silicon atom has 14 protons in its nucleus.

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  • 20. 

    What is the atomic number of Helium?

    Explanation
    The atomic number of an element represents the number of protons in the nucleus of an atom. In the case of helium, the atomic number is 2, which means that a helium atom has 2 protons in its nucleus.

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Zohra Sattar Waxali |PhD (Chemistry) |
Chemistry
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products.

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  • Jun 28, 2025
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  • Sep 18, 2011
    Quiz Created by
    Megabunny24
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