Question

The group number and period of the chromium in the periodic table are, respectively:

• A. 6 and 3
• B. 5 and 3
• C. 6 and 4
• D. 5 and 4

Answer 1

The correct option is C 6 and 4

Atomic number of Chromium = 24

Electronic configuration: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^5$

Outermost orbit = 4s

Period =4

Nearest Noble gas = $Ar$(18)

Group of chromium = 24-18=6

Group = 6