Across
- 4. Atoms have the same number of protons and _____.
- 5. Number of protons and neutrons in an atom (2 words)
- 6. Moving left to right across the periodic table, atomic radius ______.
Down
- 1. Elements are arranged by _____ table.
- 2. Number of protons in an atom (2 words)
- 3. Moving left to right across the periodic table, the number of electrons in atoms______.
- 7. Smallest particle of an element.