Question

why no fixed position be given to hydrogen what is electronic configuration of group 1 and group 2 elements​

Answer 1

Answer:

Mendeleev's periodic law could not assign a fixed position to hydrogen in the periodic table because hydrogen resembled both alkali metals (Group 1) and halogens (Group 17) in some of its properties.

Hydrogen had no fixed position in Mendeleev's Periodic Table because it resembles alkali metals by forming positive ions and resembles halogens by forming diatomic molecule.

The general form for the electron configuration of each alkali metal is ns1, where the n refers to the highest occupied principal energy level. is ns¹ and for alkali earth metals is ns²