The number of elements present in the fourth period is

The number of elements present in the fourth period is
  1. $32$
  2. $8$
  3. $18$
  4. $2$

Solution

For 4th period, $n=4$. Orbitals being filled $=4 s, 3 d, 4 p$ Number of elements in the period $=2,10,6=18$

Asked in: AP EAMCET 2013

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