Across
- 1. ______ number is found by adding the number of protons and neutrons
- 3. The elements in group 1 of the periodic table are ______ metals
- 5. Hydrogen is a ______
- 6. Smallest particle of an element that can enter into a chemical reaction
- 8. Beta emission produces a/an ______
- 13. Positively charged particle found in nucleus
- 16. Atom containing same number of protons but not neutrons
- 17. Discovered the nucleus using gold foil experiment(last name)
- 18. Negatively charged ions
Down
- 1. Polonium is a ______
- 2. Elements in group 17 of the periodic table are called ______
- 4. Positively charged ions
- 7. Arsenic is a ______
- 9. Discovered the electron using cathode ray tube(last name)
- 10. Negatively charged particles found outside nucleus
- 11. Acids always have at least one ______ atom
- 12. _____number is equal to the number of protons
- 14. Unit for atomic mass
- 15. Gamma radiation emits ________
- 18. _____particle emission is when a helium nucleus is given off