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Across 2. Atomsparticipate and form bonds in order to gain 6. this is the most important subatomic particle helps in bonding. 7. are formed by losing, gaining or sharing electrons. 9. they have eight valence electrons.except one element in their group. (2 Words) 11. Helium and Neon can not lose or gain electrons because they are 12. will gain electrons when forming compounds 13. covalent bonds are formed by

Down 1. are lost or gained when elements combine. (2 Words) 3. metals and nonmetals form (2 Words) 4. are negatively charged atoms. 5. will lose electrons when forming compounds 8. are formed by metals. 10. Noble gases are