Question

An atom with atomic number $21$ belongs to the category of:

• A. $s$-block elements
• B. $p$-block elements
• C. $d$-block elements
• D. $f$-block elements

Answer 1

The correct option is C $d$-block elements

The element with atomic number (Z) 21 is having the electronic configaration of

1s2

2s2

2p6

3s2

3p6

4s2

3d1

as tthe differentiating electron entering into the d orbital or subshell the element belongs to d-block elemet and the name of element is Scandium(Sc)