1.

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?

Answer»

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?



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