Mass
Anything that takes up space or has mass
Atoms
Building blocks of matter
subatomic particles
protons, neutrons, electrons
Resides in nucleus (center of atom):
Protons and Neutrons
Exist around the nucleus:
Electrons
Protons
positive charge
Electrons
negative charge
Neutron
neutral no charge
How many atoms on earth?
92
valence electrons
electrons in the outermost shell
Element
A pure substance made of only one kind of atom
Compound
A substance made up of atoms of two or more different elements joined by chemical bonds
Molecule
Contains an exact number of atoms held together by chemical bonds
Chemical
Pure substance that contains only one element or compound
The three states of matter are
solid, liquid, gas
macroscopic properties
properties that can be measured
chemist
A scientist who studies matter and how it changes