The atoms lose most of their electrons. Electrons are negatively charged particles that move about the atomic nucleus

A mixture is a blend of two or more kinds of matter, each of which retains its own identity and properties.

Is a group of atoms cooled to absolute zero. (0 kelvin, - 270ºC)

He created the first periodic table of elements

a substance that can be broken down into simple stable substances. Each compound is made from the atoms of two or more elements that are chemically bonded.

8

define volume, but an indefinite shape. Assumes the shape of its container. Particles are closed together but can move one another.

Metals, Metalloids, and Non-metals

Valence electrons are the electrons in the outer energy level of an atom.

Has define volume and shape, molecules are very closed together.

A pure substance or chemical substance is a material that has a constant composition(is homogeneous) and has consistent properties throughout the sample.

Shows all known elements in the universe. Organizes the elements by chemical properties