| Term | Definition |
|---|---|
| matter | anything that has mass and takes up space |
| mass | what makes up matter |
| volume | how much space matter takes up |
| density | d=m/v the amount of |
| atom | |
| proton | |
| neutron | a part of an atom found in the nucleus with a neutral or no charge |
| Periodic Table | a big grid of the elements organized into periods and columns by their chemical and physical properties |
| periods/rows | tell us how many energy levels the element has |
| groups/columns | tells number of electrons in outer that can move |
| element | a substance that cannot be broken down any more |
| valence electrons | the energy level of an atom often found on the outer ring |
| atomic number | the number of protons there are in the nucleus of an atom |
| atomic mass | how much mass an atom has |
| chemical property | when two substances combine to form a whole new substance |
| physical properties | appearance and state of matter of an object/substance |
| ionic bond | a process that happens during bonding when elements lose or gain electrons |
| covalent bond | a process that happens during bonding when elements share electrons |
| chemical change/reaction | when elements create some kind of reaction through the attraction of electrons |
| compound/molecule | when at least two elements chemically combine together to create a whole new substance |
| mixture | when at least two elements physically combine together, they do not create a whole new substance |
| Nobel gases | the most stable elements in group #18 that have 8 electrons in the outer shell |
| halogens | very easily reactive and bond-able elements with group #1 and they want to be stable |
| alkali metals | group #1 has very reactive elements with only one valence electron |
| metalloids | elements with 3-7 valence electrons that can react either way due to being in between metals and non-metals |
