[كياني]

يعني زي ككذآ :
سؤآل بروبليـم مدخخل مخي
7.78 Should be write the electron configurations for each of these elements to indicate the no. of unpaired electrons present in each atoms

5B: 4[He] 2s2 2p1 (1 unpaired electron)

10Ne: (0 unpaired electrons, Why?) because Ne is a noble gas from group 8A

15P: 10[Ne] 3s2 3p3 (3 unpaired electrons)

21Sc: 18[Ar] 4s2 3d 1 ( 1 unpaired electron)

25Mn: 18[Ar] 4s2 3d 5 (5 unpaired electrons)

34Se: 18[Ar] 4s2 3d 10 4p 4 (2 unpaired electrons)

36Kr: (0 unpaired electrons)

26Fe: 18[Ar] 4s2 3d 6 (4 unpaired electrons)

48Cd: 34[Kr] 5s2 4d 10 (0 unpaired electrons)

53I: 34[Kr] 5s2 4d 10 5p5 (1 unpaired electron)

82Pb: 54[Xe] 6s2 4f 14 5d 10 6p2 (2 unpaired electrons)


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