Q

# I have a doubt, kindly clarify. A transition metal X has a configuration [Ar] 3d4in its +3 oxidation state. What is its atomic number?:

A transition metal X has a configuration [Ar] 3d4 in its +3 oxidation state. What is its atomic number?:

• Option 1)

$25$

• Option 2)

$26$

• Option 3)

$22$

• Option 4)

$23$

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As we learnt in

'd' Block in periodic table -

In periodic table, the 'd' block elements are present between s and p block elements by the position and the three rows of transition metal are  3d 4d 5d, the 6d series is still incomplete.

- wherein

$21^{Sc}\Rightarrow 3d^1\:4s^2$

$39^{Y}\Rightarrow 4d^1\:5s^2$

$57^{La}\Rightarrow 5d^1\:6s^2$

$89^{Ac}\Rightarrow 6d^1\:7s^2$

Atmoic number of Ar is 18. Add 4 for the the d-electrons. Then add 3 more for the Oxidation state.

Hence, Atomic no. = 18+4+3 = 25

Option 1)

$25$

Option 2)

$26$

Option 3)

$22$

Option 4)

$23$

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