| A | B |
|---|
| Mendeleev arranged the elements by | increasing atomic mass |
| Alkali Metals | most reactive metals; Group 1, first column on the left |
| element location predicts | properties of the element |
| tranisition metals | group that contains the most elements |
| atomic number = | protons in nucleus |
| protons = | electrons |
| metals | malleable, ductile, and can carry an electric current |
| ductile | can be drawn out or pulled into wire |
| nonmetals | at room temperature are gases |
| electrons | move around the nucleus; have a negative charge |
| Halogens | Flourine, chlorine, bromine, iodine |
