Based on the group valency of …

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Based on the group valency of elements write the molecular formula of the following compounds giving justification for each : Oxide of first group elements. Halide of the elements of group thirteen, and Compound formed when an element, A of group 2 combines with an element, B of group seventeen

Posted by Hrithik Yadav 5 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years ago

(i) The first group elements have a common valency of 1 and the valency of oxygen is 2 and to satisfy the combining capacity of oxygen, 2 elements of first group are required. Thus the oxide of the first group elements have the common formula of M₂O.

Ex- Na₂O,K₂O,etc.

(ii) The valency of group 13 elements is 1 and the valency of oxygen is 2 and to satisfy the combining capacity of group 13 elements, 3 of halogens are required. Thus the molecular formula will be of form MX₃.

Ex- AlCl₃,BF₃,etc.

(iii) The valency of group 2 elements is 2 and that of group 17 is 1. Thus two elements of group 17 are required to combine with group 2 element.

Ex- MCl₂,CaCl₂,etc.

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