Atomic number of the element of X is 25. The oxides are $X_{2} O_{3}$ and $X_{2} O_{5}$

a. Write down the subshell electronic configuration of X?

b. What is the oxidation state of X in $X_{2} O_{3}$ ? (oxidation number of oxygen is -2)

c. To which period and block does this element belong?

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Solution

$a . E . C . = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{2}$

$b . Oxidation state of X = 2 (O . S . of X) + 3 (O . S . of O) = 0, Let suppose O . S . of X is x . = 2 x + 3 (- 2) = 0 = 2 x = + 6 = x = + 3, So, O . S . of X is + 3 .$
c. This element belongs: Group - 7 period - 4

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