Question

An atom has electronic configuration $1s^2, 2s^2 \, 2p^6, \, 3s^2 \, 3p^6 \, 3d^3, \, 4s^2$, you will place it in which group : -

• A. fifth
• B. fifteenth
• C. second
• D. third

Answer 1

Answer: (A)

fifth

Answer 2

An atom has electronic configuration
$1s^2, 2s^2 \, 2p^6, \, 3s^2 \, 3p^6 \, 3d^3, \, 4s^2$
It is a member of d-block element because the last
electron is filled in d-subshell as $3d^3$ and the
following electronic configuration is possible for
d-subshell as $(n - 1)d^{ 1 \, to \, 10 }$
Hence, it is member of fifth group.