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Question

Atomic number is ______________.
  1. the total number of protons present in the nucleus of an atom.
  2. an atom of each element having a definite combining capacity.
  3. the electrons present in the outermost shell of an atom.
  4. an outermost-shell, which had eight electrons.

A
an outermost-shell, which had eight electrons.
B
the total number of protons present in the nucleus of an atom.
C
the electrons present in the outermost shell of an atom.
D
an atom of each element having a definite combining capacity.
Solution
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The atomic number is defined as the total number of protons present in the nucleus of an atom.

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