Q. 94.9( 8 Votes )

Based on the grou

Answer :

Based on the- group valency of elements state the formula are:


(i) Let the elements of first group is A and let its oxide by denoted by ‘O’.


Since the element is first group, so its valency will be 1 and that of O is 2.


So, the chemical formula can be written as:



So, the formula is: A2O


(ii) Let the elements of group 13 be denoted by ‘M’


Let the halide be denoted by ‘X’


The valency of group M will be +3 and that of halide is -1


So, on cross multiplication of the valency, we get



So, the chemical formula is: MX3


(iii) Let element of group 2 be denoted by X and that of element of group 16 be denoted by ‘Y’


Valency of ‘X’ will be: +2


Valency of ‘Y’ will be -2


On cross multiplication of the valency of X and Y, we get



Therefore, the formula will be: XY


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