Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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Across: 1. ionic compounds conduct this 3. these are arranged in a Periodic table 4. bonding in which pairs of electrons are shared 5. the charge on an electron 6. the charge on a proton 8. the neutrally charged particle 11. smallest part of an element that can exist alone 12. for every atom, the amount of protons it has gives its atomic ------ 15. the first and smallest element 17. electrons, protons and neutrons are all this type of particle

Down: 1. negatively charged particle 2. chemically combined elements form these 7. elements that can have more than one mass number 9. positively charged particle 10. bonding in which electrons are donated 13. the atom diagrams in textbooks are named after this famous Chemist 14. two or more bonded atoms 16. the sum of the potons and neutrons in the nucleus is the realtive atomic ----