Classification of Elements and Periodicity in Properties - Result Question 4
####4. An atom has electronic configuration $1 s^{2} 2 s^{2} 2 p^{6}$ $3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}$, you will place it in which group?
(a) Fifth
(c) Second
(b) Fifteenth [2002]
(d) Third
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Solution:
- (a) The electronic configuration clearly suggest that it is a $d$-block element (having configuration $.(n-1) d^{1-10} n s^{0-2})$ which starts from group 3 and goes till group 12 . Hence with $\beta$ configuration it would be classified in the fifth group.
