MCQ
The elements having the electronic configuration $[Kr]4d^{10}\,f^{14}\,5s^2\,p^6\,d^2\,6s^2$ belongs to
- A$s-$ block
- B$p-$ block
- ✓$d-$ block
- D$f-$ block
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

$^{200}X \,:\, 90\%$ $^{199}X\, :\, 8.0\%$ $^{202}X\, :\, 2.0\%$
The weighted average atomic mass of the naturally occurring element $X$ is closest to......$amu$
