Question

The position of hydrogen is not fixed in the periodic table, sometimes it is placed with alkali metals in 1st group and sometimes with halogens in the ${17}^{th}$ group as it resembles with alkali metal metals as well as with halogens.

• A. True
• B. False

Answer 1

The correct option is A True

The element hydrogen (H) can form hydrogen halides meaning, it can form $H^{+}$ ions in HF, HCl, HBr, etc. It resembles group - I elements, Li, Na, K, etc., as they form $L{i}^{+},N{a}^{+},K^{+}$ ions, etc., in metal halides such as LiCl, NaCl, KBr. So, it can be placed in Group - I along with Li, Na, K.

The element hydrogen also resembles halogens as it can form hydrides meaning, it can form $H^{-}$ ions in NaH, LiH, etc. Halogens can form such halide ions $(F^{-},C{l}^{-},B{r}^{-},I^{-})$ in NaF, NaCl, KBr, etc. So, hydrogen can also be placed in ${17}^{th}$ group along with F, Cl, Br, I, etc. as it exhibits similar properties.