| A | B |
|---|
| Potassium | K / Atomic # = 19 / Mass # = 39 / Family = Alkali metal |
| Calcium | Ca / Atomic # = 20 / Mass # = 40 / Family = Alkaline earth metal |
| Scandium | Sc / Atomic # = 21 / Mass # = 45 / Family = Transition metal |
| Titanium | Ti / Atomic # = 22 / Mass # = 48 / Family = Transition metal |
| Vanadium | V / Atomic # = 23 / Mass # = 51 / Family = Transition metal |
| Chromium | Cr / Atomic # = 24 / Mass # = 52 / Family = Transition metal |
| Manganese | Mn / Atomic # = 25 / Mass # = 55 / Family = Transition metal |
| Iron | Fe / Atomic # = 26 / Mass # = 56 / Family = Transition metal |
| Cobalt | Co / Atomic # = 27 / Mass # = 59 / Family = Transition metal |
| Nickel | Ni / Atomic # = 28 / Mass # = 59 / Family = Transition metal |
| Copper | Cu / Atomic # = 29 / Mass # = 64 / Family = Transition metal |
| Zinc | Zn / Atomic # = 30 / Mass # = 65 / Family = Transition metal |
| Gallium | Ga / Atomic # = 31 / Mass # = 70 / Family = Boron Family |
| Germanium | Ge / Atomic # = 32 / Mass # = 73 / Family = Carbon Family |
| Arsenic | As / Atomic # = 33 / Mass # = 75 / Family = Nitrogen Family |
| Selenium | Se / Atomic # = 34 / Mass # = 79 / Family = Oxygen Family |
| Bromine | Br / Atomic # = 35 / Mass # = 80 / Family = Halogen |
| Krypton | Kr / Atomic # = 36 / Mass # = 84 / Family = Noble Gas |
