Metals, Metalloids, and Non-metals

When the substance changes from a liquid to a gas

Elements are organized on the table according to their atomic number.

2

Atomic number = # of protons

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

Atomic mass = protons + neutrons

Has neither define volume nor definite shape. The gas will expand to fill any size container and takes the shape of the container.

A  heterogeneous mixture that contains solid particles sufficiently large for sedimentation. The particles may be visible to the naked ey and will eventually se

anything that has mass and takes up space

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

When the substance changes directly from a gas to a solid without going through the liquid phase. 

He created the first periodic table of elements