Multiple choice

Elements of the same period have:

  1. same electronic configuration

  2. same number of electrons in the outermost shell

  3. same number of electronic shells

  4. same atomic size
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C Correct answer
Explanation

Number of period is equal to the number of shells occupied by the electrons of an atom in its ground state. So, the elements having same no. of electronic shells when their electronic configuration is represented in their respective ground states are placed in the same period.

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