Based on MO theory or band theory, which of the following metals would you expect to have the highest melting point? A. iron B. nickel C. chromium D. copper E. calcium
Ans is c chromium
molecular orbital of iron
Iron 26 [Ar] 4s2 3d6 there is 4 unpaired electron
molecular orbital of nickel
Nickel 28 [Ar] 4s2 3d8 there is 2 unpaired electron
molecular orbital of chromium
chromium 24 [Ar] 4s1 3d5 there is 6 unpaired electron
molecular orbital of copper
Copper 29 [Ar] 4s1 3d10 there is 1 unpaired electron
molecular orbital of calcium
calcium 20 [Ar] 4s2
from the above molecular unpaired electron theory chromium have most unpaired electron
so that from above metal chromium have the highest melting point
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