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ATOM & PERIODIC TABLE Vocab.

Across
The larges class of elements; usually shiny and solid at room temperature
Average number of atoms in a sample of an element
A systematic arrangement of the elements in order of increasing atomic number
A shorthand way of representing a specific element in formulas and equations
The number of protons in the nucleus of an atom
An element that shares some of the properties of both metals and non-metals
A neutral particle in an atom
The tendency of a substance to react with other substances
A substance formed when two or more elements join together
A substance made up on one type of atom, which cannot be broken down by a chemical reaction to form a simpler substance
Down
A class of elements that can be non-shiny solids or gases
A gas that forms about 20% of the earth's atmosphere & the most abundant element in earth's crust
A colorless and odorless gas that consists of one carbon atom and 2 oxygen atoms
A mixture of gases that form a protective layer around the earth
A negatively charged particle in an atom
A positively charged particle in an atom
A mixture of two or more metals or a metal and a non-metal
The basic unit of elements
A substance made up of two or more atoms that are chemically bonded