Question

x = 3s2 y = 3s2 3p5 write the chemical formula of the compound formed by the combination of X and Y​

Answer 1

Answer:

Correct option is

A

XY2

Valency of x=2⇒x+2

Valency of y=1⇒y+2

∴x+2y−1

xy2

Explanation:

Correct option is

A

XY2

Electronic configuration of X is:

X=1s22s22p63s23p64s2 has 2 electrons more than stable configuration. So this can be written as X2+ after removing 2 eletrcons.

Electronic configuration of Y is:

Y=1s22s22p63s23p5 has 1 electron less than stable configuration. So this can be written as Y− after gaining 1 electron

X2++2Y−=XY2

2 ions of  element Y combine with 1 ion X to give XY2 .

The resulting molecule will be stable and will have no net charge.