Why is Hydrogens place in the Periodic Table varied?
Hydrogen resemble both halogens and alkali metals. that is the reason why its position is varied. Following are some of the similarities and differences of hydrogen with alkali metals and halogens Hydrogen is a non-metal where as elements of I-A are metals. Hydrogen can form both covalent and ionic compounds. But alkali metals only form ionic compounds. Hydrogen is a gas at room temperature but alkali metals are solids. Unlike Na+ or K+ hydrogen ion (H+) is unstable in water. It readily forms hydronium ion – H3O+ Ionisation potential of hydrogen is very high when compared with alkali metals. Both Hydrogen and Halogens require one electron to complete their valence shell. Both hydrogen and Halogens are non-metals(Except iodine which has partial metallic character). Both hydrogen and Halogens acts as negative ions when combined with metals. Their molecules are diatomic. Like Halogens, hydrogen can also form both ionic and covalent bond. Both H and Halogens form compound with metals and n
