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Atomic Number Quizzes, Questions & Answers

From hydrogen’s lonely little one to hassium’s hefty hundred and eight, the atomic number of an element tells you some important information about the substance under study.

What gives an element its specific atomic number – its number of protons, neutrons, or electrons? If I add one to the atomic number of neon, a gas, why do I get Na, a metal, in its place? And what does an atomic number have to do with how massive an atom of that element is? If you need to polish up your skills with the periodic table, or if you think you can already tell the atomic number for Mg from that of Mn, take our atomic number quiz and give yourself a chemistry challenge!

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 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...

Questions: 20  |  Attempts: 16917   |  Last updated: Sep 28, 2024

An atom is a primary piece of matter made up of protons, neutrons, and electrons called subatomic particles. The atom's center is known as the Nucleus, which carries the negative charge around which electrons flow. This quiz...

Questions: 10  |  Attempts: 10954   |  Last updated: Oct 21, 2024
  • Sample Question
    If lithium has an atomic number of 3 and a mass number of 7, the correct number of protons, neutrons, and electrons, respectively, is:
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Atoms of each element contain a characteristic number of protons in their nucleus. The number of the protons in each element is what is called its atomic number. The quiz below is designed to check whether you know the atomic...

Questions: 10  |  Attempts: 471   |  Last updated: Jan 23, 2023

Do you know anything about the number of atoms and packing efficiency? Packing fraction is the fraction of size in a crystal structure that is inhabited by constituent particles. The atomic packing factor of a unit cell is...

Questions: 10  |  Attempts: 459   |  Last updated: Jan 23, 2023
  • Sample Question
    If lithium has an atomic number of 3 and a mass number of 7, the correct number of protons, neutrons, and electrons, respectively, is:
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We welcome you to this super fun Isotopes and atomic numbers quiz! By definition, atomic number is an atom's total amount of protons. In contrast, an Isotope is a variation of the element with the same atomic number but a...

Questions: 10  |  Attempts: 94   |  Last updated: Aug 16, 2023
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    What's the atomic number of oxygen? 
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