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Classification Of Elements And Periodicity In Properties

Question
CBSEENCH11005464
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Elements A, B, C and D have atomic numbers 7, 19, 29 and 36 respectively. Write the electronic configuration and also predict their period, group and block.

Solution

(i) A(Atomic number 7):
Electronic configuration: 1s2 2s2 2p3
Period = 2nd
Group = 15
Block  = p-block
(ii) B(Atomic number 19):
Electronic configuration: 1s2 2s2 2p6 3s2 3p6 4s1
Period = 4th
Group = one (1)
Block = s-block

(iii) C (Atomic number 29):
Electronic configuration:
1s2 2s2 2p6 3s2 3p6 4s1 3d10
Period = 4th
Group = Eleven (11)
Block = J-block

(iv) D (Atomic number 36)
Electronic configuration:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
Period = 4th
Group = Eighteen (18)
Block = p-block

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What is the number of groups in: (i) p-block  (ii) d-block?

How many elements are present in:
(i) second period    
(ii) fourth period    
(iii) sixth period?

What is the name given to the s-block elements?

To which block the element with outer electronic configuration 4s23d10 belongs?

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In terms of electronic configuration,
what is common in a given period and group?

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