Across
- 2. Gain of electrons
- 3. Which group of atoms gain 3 electrons?
- 5. ____ number that tells us the total number of protons and neutrons in an atom
- 8. Polyatomic ion with the formula NH3
- 9. Which group one element produces a flame when reacting with water?
- 10. How many elements exist as diatomic elements?
- 11. H2O2 is the _________ formula of hydrogen peroxide
- 12. A compound that comprises of non-metal(s) only
Down
- 1. Another name for the halogen-halide reaction
- 2. The 'r' in RFM
- 4. Atoms of the same element with the same number of protons but a different number of neutrons
- 5. Unit of measurement for the amount of something
- 6. A diagram that can be used to explain the formulae of compounds
- 7. A positive ion
- 10. How many protons do carbon atoms have?
- 13. atoms In the first shell of electrons (in word form)