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Q.

Atomic number (Z) is equal to _______________.

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a

Number of electrons in the outermost shell

b

 Number of protons in the nucleus of an atom.

c

Number of shells in an atom

d

 Number of neutrons in the nucleus of an atom.

answer is B.

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Detailed Solution

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  • The atomic number (Z) is equal to the number of protons in the nucleus or the number of electrons in an electrically neutral atom of atom.
  • Atoms of different elements have different atomic numbers.
  • Atomic number = Number of protons
  • Example - In a sodium atom(Na), there are 11 electrons and 11 protons. Thus the atomic number of Na atom = number of electrons = number of protons = 11.
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