| A | B |
|---|
| proton | positive charge |
| neutron | neutral charge |
| electron | negative charge |
| proton and neutron | found in the nucleus |
| nucleus | middle of the atom |
| electron cloud | area where electrons are found |
| heterogeneous | salad, taco, and pizza are examples of this type of mixture |
| atom | building block of all matter |
| isotopes | atoms that have the same number of protons, but different number of neutrons |
| element | substance that has only one kind of atom in it |
| mass number | the number of neutrons and protons in an atom |
| atomic number | equal to the number of PROTONS in an atom |
| homogeneous | air, milk, and juice are examples of this type of mixture |
| compounds | NaCl, H2O-both are examples of __. |
