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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

 
Answers (1)
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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

This answer is correct

Option 2)

26

This answer is incorrect

Option 3)

22

This answer is incorrect

Option 4)

23

This answer is incorrect

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