Q.

An element has electronic configuration 1s2 2s2 2p6 3s2 3p3.  Predict their period, group and block 

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a

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

b

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

c

Period = 3rd, block = p, group = 15

d

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

answer is A.

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Detailed Solution

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By observing principal quantum number (n), Orbital (s, p, d, f) and equating no.of  e-  ’s we are able to find the period, block and group of element in periodic table

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