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Across 5. atoms share electrons to make this. 6. formed as a result of this . 8. formed between metal ions. 10. negative, made up by nonmetals. 11. formed because of transfer of electrons. 12. Bonding takes place between _____ _____ in the outer energy level. 13. Atoms bond to achieve this. 14. a group of two or more atoms held together through chemical bonding is called . 15. ionic bonds are made by these.

Down 1. made up of more than one atom. 2. Noble gases have 8 valence electrons except this 3. Atoms lose or gain electrons to complete their. ........ 4. covalent bods are made up of. 5. Atoms join together with other atoms in a process . 7. formed because of loss of electrons. 9. ions made up of single atom.