| Term | Definition |
|---|---|
| Matter | Is everything that has mass and takes up space |
| Mass | How much matter is in an object |
| Density | Relates to the mass in given volume |
| Volume | The amount of space matter occupies |
| Atom | Basic particle in all elements |
| Electron | A particle with a negative charge |
| Proton | A particle with positive charge |
| Neutron | A particle with neutral charge |
| Periodic table | A grid with all known elements and their atomic number |
| Element | is the simplest substance cannot be broken down |
| Periods/Rows | Tells how many energy levels an element has |
| Groups/Columns | How many valence electrons an element has |
| Valence electrons | Electrons on outer shell |
| Atomic number | How many protons in the middle of elements nucleus/ usually same electrons and neutrons |
| Atomic Mass | How much mass in a elements atoms |
| Chemical property | The ability to combine with another substance to form a new one |
| Physical property | The appearance or state of a substance |
| Ionic Bond | Elements lose/gain electrons during bond |
| Covalent bond | When electrons are shared during bonding |
| Chemical change | Elements bond through attractive force of electrons |
| Compound/Molecule | Two or more elements in a specific ratio / new substance |
| Mixture | Two or more substances combine and keep same properties |
| Nobel Gases | All elements in group 18 Most stable |
| Halogens | All elements in group 17 very reactive 7 valence electrons |
| Alkali Metals | All elements group 1 very reactive only 1 valence electrons |
| Metalloids | Elements between metal and non 3-7 valence Electrons |
