Across
- 1. each vertical column of the periodic table
- 3. a negatively charged subatomic particle
- 4. an atom that has the same number of protons but a different number of neutrons
- 6. positively charged subatomic particles
- 7. the smallest particle of an element that retains its identity in a chemical reaction
- 8. the total number of protons and neutrons in an atom
- 10. the tiny central core of an atom and is composed of protons and neutrons
Down
- 2. an arrangement of elements in which the elements are separated into groups based on a set of repeating properties
- 5. each horizontal row of the periodic table
- 9. subatomic particles with no charge but with a mass nearly equal to that of a proton