Across
- 3. What a reaction produces
- 6. A reaction which requires energy
- 8. The number of electrons in magnesium
- 9. When an atom has too much energy and becomes unstable
- 10. When a chemical reaction has the same number of atoms in its products and reactants
- 11. Where the electrons in an atom are stored
- 13. The number of atoms in 2HCl
- 14. What a chemical reaction begins with
- 16. Where the protons and neutrons in an atom are stored
- 17. The same element with a different number of neutrons
- 19. The type of radiation that does not eject a high energy particle
Down
- 1. The charge of an electron
- 2. The way electrons are organised
- 4. The part of an atom with a positive charge
- 5. The weight of an atom is the number of protons plus the number of ....
- 7. The particle produced by radiation with two protons and two neutrons
- 10. The type of radiation which changes a neutron to a proton
- 11. A reaction which releases energy
- 12. The name of the table where elements are listed
- 15. The number of electrons in magnesium's outer shell
- 18. The maximum number of electrons in the second electon shell