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The number of unpaired electrons in 1s2 2s2 2p4 is:
(1) 4
(2) 2
(3) 0
(4) 1
Ans: 2
Which one of the following is not isoelectronic with O 2- : (1) N- 3 (2) F - (3) Tl + (4) Na + Ans: Tl +
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