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3 January, 13:57

The atomic number is the number of protons in an atom. How many protons does the element He have?

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  1. 3 January, 17:26
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    The number of protons in He is 2.

    Explanation:

    Atomic number refers to the number of protons in the nucleus of an atom.

    He is a noble gas whose atomic number is 2.

    Therefore, the number of protons in the nucleus of He is 2.

    Also, the number of neutrons in the nucleus of He is 2

    And mass number is the sum of protons and neutrons present in the nucleus of an atom.

    Therefore, mass number of He = 2 + 2 = 4
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