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Q.

An element has electronic configuration 1s22s22p63s23p4 . Predict their period, group and block

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a

Period = 3rd, block = p, group = 16

b

Period = 5th, block = s, group = 1

c

Period = 3rd, block = p, group = 10

d

Period = 4th, block = d, group = 12

answer is A.

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Detailed Solution

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Highest “n” value = period
Subshell in which last electron enters = block
Group number = 10 + ns + np e¯s.

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