Across
- 2. A pure substance made of two or more atoms
- 3. The name for electrons in the outer shell
- 5. The protons and neutrons added together.
- 6. A pure substance made of one type of atom
- 7. A horizontal row on the periodic table
Down
- 1. A vertical column on the periodic table
- 2. Acidity, reactivity, and combustibility are examples of
- 4. How elements are arranged on the periodic table