1.

Match the atomic number 2, 4, 8, 15 and 19 with each of the following : (i) A solid non-metal belonging to the third period. (ii) A metal of valency 1. (iii) A gaseous element with valency 2. (iv) An element belonging to Group 2. (v) A rare gas.

Answer»

(i) 15

(ii) 19

(iii) 8

(iv) 4

(v) 2



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