| A | B |
|---|
| charge of atoms | electrically neutral |
| cations | positively charged ions |
| anions | negatively charged ions |
| mass number | #of protons and neutrons |
| atomic number | # of protons |
| metals | elements found on the left of the periodic table |
| nonmetals | elements found on the right side of the periodic table |
| noble gases | Family with 8 electrons in outer energy level |
| metalloids | found on the "stairstep" in the periodic table |
| Halogens | Active nonmetals with 7 electrons in outer energy level |
| alkali metals | most active metals |
| Atomic mass unit | The mass of one proton |
| periods | horizontal rows in the periodic table |
| groups/families | vertical columns in periodic table |
| electron cloud | energy levels containing electrons |
| 8 electrons | 2nd energy level will hold |
| isotopes | elements with similar chemical properties |
