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cHaPtEr 12 vOcAbUl
physical science
| Question | Answer |
|---|---|
| Periodic | describes something that occours at regular intervals. |
| Periodic Law | repeating properties of elements change according to the element's atomic number. |
| Period | a horizontal row of elements. |
| Group | a vertical column of elements that are similar in chemical properties. |
| Alkali Metals | one of the elements in group one of the periodic table. |
| Alkaline-Earth Metal | one of the elements in group two of the periodic table. |
| Halogen | one of the elements in group seventeen of the periodic table. Can form salts with metal. |
| Noble Gas | one of the elements in group eighteen of the periodic table. Unreactive. |