Question

The atomic number of the element X and Y are 20,26 respectively. When these elements

combines with chlorine. Three compounds XCl2,YCl2,YCl3 are formed. What is the specialty

of the oxidation number of Y, compare to that of X? l​

Answer 1

Answer:

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Explanation:

The element X is calcium-

20

Ca−1s

2

,2s

2

,2p

6

,3s

2

,3p

6

,4s

2

The element Y is iron-

26

Fe−1s

2

,2s

2

,2p

6

,3s

2

,3p

6

,4s

2

,3d

6

Calcium forms only CaCl

2

whereas Iron forms both FeCl

2

as well as FeCl

3

. This is because of the d− subshell that Iron atom has.

Calcium can lose only two electrons and form CaCl

2

But, due to the d−shell present in Fe, when it forms FeCl

2

, the configuration of d−shell in FeCl

2

is d

6

. When it again loses an electron to form FeCl

3

it forms a stable half-filled d

5

configuration. That's why Fe has a variable oxidation state