Atomic number of an element of 43. The correct set of it's period number , block and group number is `:`

Options

A. `{:(,"Period no.",,"Block",,"Group no."),((1),5,,d,,5):}`
B. `{:(,"Period no.",,"Block",,"Group no."),((2),4,,d,,7):}`
C. `{:(,"Period no.",,"Block",,"Group no."),((3),5,,d,,7):}`
D. `{:(,"Period no.",,"Block",,"Group no."),((4),5,,s,,7):}`

Answer

3

Explanation

Period no. `=` Last orbit no.` " , "` Block `=` Subshell in which last electron enters
Gr. No. of `d-` block elements `=(n-1)d+`ns electrons.