Across
- 2. the three parts of a atom
- 3. has a positive electrical charge
- 8. all materials are made up of very small materials called atoms, atoms them selves are made of protons electrons and neutrons
- 11. a pure substance
- 12. how you find the number of neutrons in an atom
Down
- 1. if the atom has the same number of electrons and protons, the atom is what
- 4. protons and neutrons
- 5. the same element different number of nutrons
- 6. has a negative electrical charge
- 7. is made up of protons electrons and neutrons
- 9. why the mass on the periodic table is a decimal
- 10. is neutral