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13 August, 22:16

he mass number of an atom is equal to the sum of protons and neutrons in the nucleus. A helium atom has 2 protons and 2 neutrons. What is the mass number of this atom?

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  1. 14 August, 01:29
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    Mass number = 4

    Explanation:

    The atom of an element is composed of protons, electrons and neutrons. The number of protons is equal to the number electrons in a neutral atom. The atomic number of an element denoted by symbol Z is the number of protons in the atom of that element while the mass number of an element denoted by symbol A is the sum of the proton number (atomic number) and the neutron number in that element. i. e. A = Z + N where A = Mass no., Z = Atomic/Proton no., N = Neutron no.

    Based on the information above, we can calculate the mass number of Helium element (He), which has 2 protons and 2 neutrons in the nucleus of its atom.

    Using A = Z + N

    Where A = Mass no

    Z = Atomic no = 2

    N = Neutron no = 2

    A = 2 + 2

    A = 4

    Therefore, mass number of Helium is 4.
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