Across
- 2. calcium and magnesium are apart of what family.
- 4. much larger and heavier than electrons.
- 5. of the possible energies an election may have in an atom.
- 8. what is the last name of the man who invented the periodic table.
- 10. there are how many periods on the periodic table.
Down
- 1. equal to the number of protons plus neutrons.
- 3. the average mass of the naturally occurring isotopes of an element.
- 6. very light particles.
- 7. large and heavy like protons.
- 9. there are how many groups on the periodic table.