MCQ
Chalcogen group elements are:
- A$Se,$ $\mathrm{Tb}$ and $\mathrm{Pu}$.
- ✓$Se, Te$ and $Po.$
- C$\mathrm{S}, \mathrm{Te}$ and $\mathrm{Pm}$
- D$O, Ti$ and $Po.$
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Assume Planck's constant $( h )=6.4 \times 10^{-34}\,Js$ Speed of light $( c )=3.0 \times 10^8\,m / s$ and Avogadro's constant $\left( N _{ A }\right)=6 \times 10^{23} / mol$