Across
- 5. Horizontal rows on a periodic table. Tells you how many outer electron shells/energy levels an element has.
- 7. If a atom has more electrons than protons, or more protons than electrons its called a...
- 8. Neutral charge particle.
- 9. A substance that contains atoms of more then two different elements that are chemically joined together. Example: Water.
Down
- 1. Negatively charged particle.
- 2. Vertical columns on a periodic table. Tells you the number of electrons in the outer shells.
- 3. Positively charged particle.
- 4. Made up of atoms that are held together by chemical bonds.
- 6. Building blocks of life. Neutral charge.