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6. The right side of the periodic table contains these.
- metals
- non-metals
- isotopes
7. Different forms of the element which have the same number of protons but a different neumber of neutrons.
- isotopes
- elements
- particles
8. The creator the periodic table left these as he realised there were undiscovered elements that should be in them.
9. The creator of the periodic table.
10. In the centre of the atom, contains protons and neutrons.
11. neutral (or no charge) particle.
12. Electrons occupy these and they are sometimes called shells.
- electron levels
- energy levels
- energy shells
13. The total number of protons and neutrons in the element.
- mass number
- atomic number
- weight number
14. The number that shows the amount of protons (and electrons) in an element.
- atomic number
- mass number
- atom number
15. They have a negative charge and move around the nucleus in shells.
- electrons
- protons
- neutrons
16. The name of group 7 in the periodic table.
- halogens
- alkali metals
- noble gases