1						2
												3
																					4
																5
		6														7
		8										9
									10													11
		12
		13														14
		15													16
		17		18								19								20
						21											22
23
															24
	25
												26

Across 1. This element has the lightest atomic weight 3. This element normally has 7 electrons 5. These are the results of a chemical reaction 8. This element has an atomic number of 8 10. This type of reaction absorbs energy 12. This particle has the same mass as neutrons 13. These are the ingredients of a chemical reaction 14. This particle has an electrical charge of zero 15. This element is represented by the symbol 'Cl' 17. This element has 13 protons and 13 neutrons in the nucleus 19. This element has an atomic number of 80 21. This particle is the smallest of the atom 23. This element normally has 53 electrons 24. This element is represented by the symbol 'Si' 25. The electron reside in this part of the atom 26. This element has an atomic number of 11

Down 2. This reaction breaks apart water molecules in to hydrogen and oxygen gas 4. This element has 20 protons in the nucleus 6. This element would have 30 electrons if it gained 1 electron 7. The products of this reaction are soot, carbon dioxide, and water 9. This element has an atomic weight of 39.0983 10. This type of reaction releases energy 11. This element is the 2nd noble gas 16. Protons and neutron reside in this part of the atom 18. This element has 92 protons in the nucleus 20. This element has an atomic weight of 20.1797 22. This element has 2 protons in the nucleus