MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

The atomic number of Silicon (Si) is 14. The electronic configuration of Si is 1s^ 2 2s^ 2 2p^ 6 3s^ 2 3p^ 2 . In the 3p subshell, there are 2 electrons which occupy separate orbitals according to Hund's rule. Thus, Si has 2 unpaired electrons. The atomic number of Chromium (Cr) is 24. The electronic configuration of Cr is [Ar] 3d^ 5 4s^ 1 . In the 3d subshell, there are 5 unpaired electrons and in the 4s subshell, there is 1 unpaired electron. Thus, Cr has 6 unpaired electrons. The number of unpaired electrons in Si and Cr are 2 and 6, respectively. Answer: 2 and 6