DEFINITIONS

DEFINITIONS

1. Atoms: small particles that can not be divided

2. Elements: contains atoms of one type

3. Molecule: contains 2 or more atoms chemically bonded together

4. Compound: contains atoms of two or more elements

5. Mixtures: substances which are not chemically bonded together

6. relative atomic mass (Ar): mass of the atoms of an element

7. isotopes: atoms of the same element which have the same number of protons but different numbers of neutrons

8. moles: to represent amount of a susbtance