An oxygen molecule consists of two oxygen atoms double-bonded together. It's nonpolar because the electrons are shared equally between both atoms.
Imagine you and your best friend have identical strength and are playing tug-of-war with a rope (representing electrons). Since neither can pull harder than the other, you both stay in place - this is what happens in an O2 molecule!
Nonpolar Molecule: A molecule where electron distribution is equal and there are no partial charges on any part of it.
Double Bond: A chemical bond where four bonding electrons are shared between two atoms.
Elemental Molecules: Molecules composed entirely from atoms from the same element.
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