A5 B7C10
(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?

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

Element Atomic number

A5
B7
C10

(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?

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(i) Element C belongs to group 18 as its electronic configuration of element C (10) = 2,8

(ii) Element B belongs to group 15 as its electronic configuration of element B (15) = 2,8,5

(iii) Element A belongs to group 13 as its electronic configuration of element A (5) = 2,3

(iv) The elements A, B, and C all belong to period 2 because all three have the same valence shell filled, i.e, the L shell.

Updated on: 10-Oct-2022

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