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The number of unpaired electrons in 1s2 2s2 2p4 is:
(1) 4
(2) 2
(3) 0
(4) 1
Ans: 2
Covalent Bond Purely electrostatic attractions between ions are nondirectional, but with increasing covalent character the directional properties of valence orbitals become more
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Which of the following electronic configurations is not possible: (1) 1s 2 , 2s 2 (2) 1s 2 , 2s 2 , 2p 6 (3) 3d 10 4s 2 4p 2
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