Question

The element with atomic number $57$ belongs to

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

Answer 1

The correct option is A d-block

The element with atomic number $57$ is La with electronic configuration $\left[Xe\right]5d^{1}6s^2$. As last electron fills in d orbital, hence this element belongs to the d block element.

Hence, (C) is the correct option.