Question

What classifies a substance as an element?

What classifies a substance as a compound?

Actually, answer what the question is asking and give a short answer. No copying and pasting.

Answer 1

The difference between an element and a compound is that an element is a substance made of same type of atoms, whereas a compound is made of different elements in definite proportions.Examples of elements include iron, copper, hydrogen and oxygen. Examples of compounds include water (H2O) and salt (Sodium Chloride - NaCl).