Question

State the formula based on the group valency of elements

Answer 1

HEY HERE IS YOUR ANSWER

Based on the group valency of elements state the formula for the following giving justification for each:

(i) Oxides of 1st group elements,

(ii) Halides of the elements of group 13, and

(ii) Compounds formed when an element of group 2 combines with an element of group 16.

Based on the group valency of elements state the formula are: (1) 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: A20

(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

Elements X Y

Valency +2 -2

Therefore, the formula will be: XY

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