Explanation:
A hydrogen atom is composed of a proton (including a neutron) and electron. In chemical reaction with Hydrogen, the atom can easily gain or lose its only electron in its 1s orbital shell to achieve stable electron configuration. Â
It can behave like alkali metals when it loses its valence electron in its outermost orbital shell in a reaction. An example is just like metals, it can react with non-metals like chlorine (to form HCl).
Hydrogen can also act as a non-metal and gain an electron in its outermost valence shell to achieve stable electron configuration of 1s². This way it can behave like a halogen. It can react with metals such as Sodium to form a NaH (Sodium Hydride).
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