What are metals and non metals ?
:-)

Metals are defined as elements that have one, two, or three electrons in their valence shell. Non-metals are elements containing 4, 5, 6, or 7 electrons in their outermost shell.

Explanation:

Metals are those substances which are generally hard, good conductor of heat and electricity. For example ;gold, silver etc.

Non metals are those substance which are generally soft, bad conductor of heat and electricity. For example ; wood, plastic etc.

i think the answer is second