Why do metals always lose electron whereas non-metals always gain electron to achieve noble gas configuration?

Q. How do non-metals achieve their nearest noble gas configuration?

Q. Most of the atoms tend to lose, gain or share electrons to achieve the nearest noble gas electronic configuration.

Q. Sodium tends to lose electron(s) to achieve nearest noble gas configuration.

Q. The _________ states that elements gain or lose electrons to attain an electron configuration of the nearest noble gas.

Q. Assertion :Alkali metals are strong reducing agents, while halogens [non-metals], are strong oxidising agents. Reason: Metals have 1,2 or 3 valence electrons so they always ionize by losing electrons while non metals have 4, 5, 6 or 7 valence electrons so they ionize by gaining electrons.