1, How many protons are in an atom of hydrogen?, 2, What is the maximum number of electrons in the first energy level (shell)?, 3, What is the atomic number of lithium?, 4, How many protons are in an atom of beryllium?, 5, How many electrons are in a neutral atom of boron? , 6, How many electrons are in a neutral atom of carbon?, 7, What is the atomic number of nitrogen?, 8, What is the maximum number of electrons in the second energy level?, 9, What is the atomic number of fluorine?, 10, How many protons are in a neon atom?, 11, How many electrons are in a neutral atom of sodium?, 12, What is the atomic number of magnesium?.
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Atomic number
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