| A | B |
|---|
| matter | anything that has mass and takes up space |
| atoms | are the building blocks of matter |
| element | a substance that contains only one type of atom |
| proton | positive charge particle |
| neutron | particle with no charge |
| electron | negatively charge particles |
| atomic number | number of protons in an atom's nucleus |
| mass number | number of protons and neutrons in the nucleus of an atom |
| isotopes | atoms of the same element that have different number of neutrons |
| compound | when atoms of more than one element combine |
| ex. of a compound | water |
| chemical properties | describe the change that occurs when one substance reacts with another substance. |
| chemical bond | force that holds atoms in compounds together |
| covalent bond | formed by the sharing of electrons |
| ionic bonds | atoms that combine if they become positively or negatively charged |
| metallic bonds | electrons flow freely from one ion to another |
| form without the interaction of electrons | hydrogen bonds |
| hydrogen bonds | form when the positive end of one molecule is attracted to the negative end of another molecule |
| cohesion | the attraction of water molecules to other water molecules that allow raindrops to form and water to bead up on surfaces |
| mixture | two or more substances that are not chemically combined |
| solution | another name for homogeneous mixture |
| heterogeneous mixture | components are not mixed evenly |
| homogeneous mixture | compounds are mixed evenly |
