Atomic Reactivity

2. An electron in the outer shell of an atom which can combine with other atoms to form molecules.
6. A set of chemical symbols showing the elements present in a compound and their relative proportions.
8. A solid that forms and settles out of a liquid mixture.
9. A process that involves rearrangement of the molecular or ionic structure of a substance.
10. A representation of a chemical reaction using symbols of the elements and formulas of compounds.
11. A table of the chemical elements arranged in order of atomic number.
12. A substance that is formed as the result of a chemical reaction.
13. The basic unit of a chemical element.

1. A notation of one or two letters representing a chemical element.
3. A substance that takes part in and undergoes change during a reaction.
4. A substance that cannot be broken down into simpler substances by chemical means.
5. A characteristic of a substance that is observed during a reaction in which the chemical composition changes.
7. The number of protons in the nucleus of an atom, which determines the chemical properties of an element.