Q. 613.7( 3 Votes )
The atomic number
(i) Element C belongs to group 10 because it has 8 elements in the last shell and its valency is 0.
(ii) elements belongs to group 15 because it has 5 electrons in its last shell.
(iii) an element belongs to the group 13 because it has 3 electron in its valence shell.
(iv) These elements belong to the 2nd period because all the 2 shells are filled.
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