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Across 4. This is found at the centre of the atom 5. Group 1 metals react with chlorine to form a metal... 7. This tells us how many electrons or protons an element has (2 words) (2 Words) 8. Subatomic particle that has a negative charge 11. This is the name for the Group 7 elements 14. This is the name for the group 0 elements (2 words) (2 Words) 15. Found in the nucleus of an atom; it has a neutral charge.

Down 1. This element has 5 neutrons 2. This is the name for the group 1 elements (2 words) (2 Words) 3. Group 3 elements all have how many electrons in there outer energy level? 4. This element has 7 electrons 6. A postively charged sub-atomic particle 7. We can use this to calculate the number of neutrons in an element (2 words) (2 Words) 9. The group 0 elements all have an outer shell that is... 10. Group 1 metals only have one electron in their outer energy level which makes them very... 12. The name for elements which have the same number of protons and electrons, but a different number of neutrons 13. The overall charge of an atom is...