Question

8. Atomic weight of an element is :
a) Twice the number of electrons in its atom
b) Equal to the number of protons in the nucleus of its atom
c) twice the number of neutrons in the nucleus of its atom
d) equal to the sum of neutrons and protons in the nucleus of its atom

Answer 1

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b) Equal to the number of protons in the nucleus of its atom

The total weight of an atom is called the atomic weight. It is approximately equal to the number of protons and neutrons, with a little extra added by the electrons. The stability of the nucleus, and hence the atom's radioactivity, is heavily dependent upon the number of neutrons it contains.