Question

Two elements A and B have following
electronic configuration
A = 1s 2s2 2p6 3s2
B = 1s2 2s2 2p6 3s2 3p3
If expected compound formed by A and B is
Ax By then sum of x and y is​

Answer 1

Answer is

X=1s

2

2s

2

2p

6

3s

2

3p

6

4s

2

has 2 electrons more than stable configuration. So this can be written as X

2+

after removing 2 eletrcons.

Electronic configuration of Y is:

Y=1s

2

2s

2

2p

6

3s

2

3p

5

has 1 electron less than stable configuration. So this can be written as Y

−

after gaining 1 electron

X

2+

+2Y

−

=XY

2

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

2

.

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

Answer 2

Answer:

ANSWER

Valency of element X is 2 (2 electrons in the outermost shell) while that of element Y is 1 (1 electron required in the outer most shell to complete octet) So the formula of the compound between X and Y is XY

2

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