pictures and notes are based and from YouTube Atoms VS Molecules Atoms: any element on the periodic table (Ex: oxygen, nitrogen, phosphorus) Molecules: made of multiple atoms Atoms can be the same (water) or different (nitrogen gas) Polar Molecules: molecules with an uneven electron distribution > positive + negative charges Electronegativity (ONE reason why molecules are polar): measures how strongly an atom attracts electrons High Electronegativity: attracts electrons very