1.
is a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
3.
how something is arranged
4.
electrons in the outermost energy level of an atom that influence how an element will react with other substances
5.
an atom with a net electrical charge resulting from the loss or gain of electrons
6.
the smallest particle of an element maintaining the chemical identity of that element
7.
substances that cannot be separated into simpler substances
8.
substances formed when two or more elements are chemically joined
9.
the layer of gas surrounding a planet that is held in place by gravity
10.
the sum of all living matter on Earth
11.
all the water on Earths all the water on earth's surface including all water sources above and below the surface
12.
is made up of many different kinds of atoms and molecules
13.
the rigid outer part of the earth, consisting of the crust and upper mantle
