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in Periodic Table and Electronic Configuration by (37.7k points)
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Atomic number of some elements are given. 

A – 15, B – 8, C – 11, D – 18, E – 20, F – 34, G – 10 

a. Which are the elements in same period? 

b. Which are the elements in same group?

1 Answer

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A -1s2 , 2s2 , 2p6 , 3s2 , 3p3 (group -15 period – 3) 

B – 1s2 , 2s2 , 2p4 (group –16 period – 2)

C – 1s2 , 2s2 , 2p6 , 31 (group – 1 period – 3) 

D – 1s2 , 2s2 , 2p6 , 3s2 , 3p6 (group – 18 period – 3) 

E – 1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 4s2 .(group – 2 period – 4) 

F – 1s2 , 2s2, 2p6 , 3s2 , 3p6 , 3d10 , 4s2 , 4p4 (group – 16 period – 4) 

G – 1s2 , 2s2 , 2p6 (group – 18 period – 2) 

a. A, D same period ; 

B, G same period 1 

b. B, F same group ; 

D, G same group

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