A) fifth group
B) fifteenth group
C) second group
D) third group
Correct Answer: A
Solution :
An atom has electronic configuration \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{3}},4{{s}^{2}}\] It is a member of d-block element because the last electron is filled in d-subshell as \[3{{d}^{3}}\] and the following electronic configuration is possible for d-subshell as (n - 1)d-subshell Group No. IIIB IVB VB VIB VIIB. VIII VIII VIII IB IIB (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) \[n{{s}^{2}}(n-1){{s}^{2}}{{p}^{6}}{{d}^{1}}\,{{d}^{2}}\,\,\,{{d}^{3}}\,\,{{d}^{5}}\,{{d}^{6}}\,{{d}^{7}}\,{{d}^{8}}\,{{d}^{9}}\,{{d}^{10}}\] Hence, it is a member of fifth group.
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