MCQ
The element $Z = 117$ should
- Abe a halogen
- Bhave seven valence electrons
- Chave a valence shell configuration of $7s^2\, 7p^5$
- ✓have all of the above properties
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$B.E. (H-H) = x_1 ; B.E. (O = O) = x_2$ ;
$B.E. (O -H) = x_3$
Heat of vaporisation of water $= x_4$ then $\Delta {H_f}$ [heat of formation of liquid water] is