A, B, C, D are four elements. The electronic configuration is given below and find the answers in the following (Hint. The symbols are not real)

A – 2, 2

B – 2, 8, 5

C – 2, 7

D – 2, 8, 2

a) Find the elements belonging to the same period?

b) Find the elements belonging to the same group.

c) ‘C’ belongs to which period and group?

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Solution

a) B, D and A, C belong to the same period because the number of shells are same.

b) A and D belong to the same group because the number of electrons in the outermost shell is the same.

c) ‘C’ belongs to the second period and 17th group.

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Similar questions

The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

2, 8, 2

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