Across
- 2. A horizontal row of elements in the modern periodic table.
- 5. A subatomic particle in an atoms nucleus that has a positive charge.
- 7. The extremely small positively charged dense center of an atom, contains protons and neutrons.
- 8. A highly reactive group 17 element.
- 10. The smallest particle of an element that retains all properties of the element.
Down
- 1. An ion with a positive charge.
- 3. A negatively charged, fast-moving particle with an extremely small mass.
- 4. A vertical column of elements in the periodic table; arranged by increasing atomic number.
- 6. A neutral subatomic particle in an atomic nucleus with a mass nearly equal to a proton.
- 9. An ion with a negative charge.