gneet

Study Companion

For more NEET and AIIMS mcq on Structure of Atom Visit www.gneet.com
Question
Q186) Among the following which one is not paramagnetic? [Atomic numbers; Be = 4, Ne = 10, As = 33, Cl = 17]



SOLUTION

Ne+2 = 8 = 1s2, 2s2, 2p4 = 1 unpaired electron Be+1 = 3 = 1s2, 2s = 1 unpaired electron Cl = 18 = 1s2, 2s2, 2p6, 3s2, 3p6 = 0 unpaired electron As+= 32 = 1s2, 2s2, 2p6, 3s2, 3p6 4s2, 3d10, 4p3 = 3 unpaired electron If electrons are unpaired then it is not paramagnetic
Answer:(c)