Across
- 1. Electrons in the outermost energy level of an atom
- 3. a chemical _______ is a series of letters and numbers used to represent a molecule/compound.
- 6. a chemical_______ is a shorthand way to represent a chemical reaction.
- 7. A compound formed by an ionic bond (or bonds); usually a metal and a nonmetal bonded together.
- 9. A substance made up of atoms of two or more different elements joined by chemical bonds
- 10. A substance produced in a chemical reactionion atom that has a positive or negative charge
- 11. bond formed by the sharing of electrons between atoms
- 13. a chemical compound formed by the sharing of electrons; usually two nonmetals
- 14. Number of protons in the nucleus
- 15. A negatively charged ion; gains 1 or more electrons
- 17. two or more atoms held together by covalent bonds
- 18. the attractive force that holds atoms or ions together
- 19. A chemical substance that is present at the start of a chemical reaction; reacts
- 20. a change where a new substance is produced with different chemical properties.
- 22. causes a chemical change which forms new substances.
Down
- 2. a pure substance made up of one kind of atom.
- 4. Matter can be neither created nor destroyed.
- 5. A small, lowered number in a chemical formula that tells the number of atoms of an element in a molecule; CAN NOT change this when balancing a chemical equation!
- 8. A large number in front of a chemical formula in an equation that indicates how many of that molecule there are; this number CAN be changed when balancing chemical equations!
- 12. the smallest particle of a covalent compound
- 13. A positively charged ion; gives up one or more electrons
- 16. An atom is always trying to gain to lose electrons to get to a full valence shell. For most that means getting to 8 electrons.
- 21. a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion