Chemistry Crossword

4. neutral particle in the nucleus of an atom
7. Group 7 on the Periodic Table and are all non-metals
10. an element which is not metallic
11. absorbs heat energy
14. slow chemical change that occur when oxygen in the air in the air reacts with metal
15. the chemical element of atomic number 12
17. a protein that speeds up (catalyses) a reaction
20. mixture of evenly dispersed substances, such as many milks
21. a substance that is made up of two or more chemically bonded elements
22. The chemical element of atomic number 6
24. positively charged centre of an atom

1. a chemically bonded number of atoms that are electrically neutral
2. the chemical element of atomic number 16
3. Invisible negatively charged particle that orbits the nucleus of an atom
5. group 18 elements, those whose outer electron shell is filled
6. the chemical element of atomic number 26
8. mass of one atom of an element calculated from the total number of protons
9. The smallest part of an element that is representative of that element
12. releases heat energy
13. a positive unit or subatomic particle that has a positive charge
15. a protein that speeds up (catalyses) a reaction
16. the chemical element of atomic number 7
18. a colorless, odorless, highly flammable gas, the chemical element of atomic number 1.
19. Chemical element that is a good conductor of both electricity and heat
23. atom that has become electrically charged because it has lost or gained electrons