atom
simplest particle of an element that retains the properties of the element
atomic number
# of protons
chemical bonds
attractive forces that hold atoms together
compound
two or more types of atoms in fixed proportions
covalent bond
bond formed when two atoms share one pair or more pairs of electrons
electron
subatomic particle with a negative charge
element
made of one type of atom; cannot be broken down into simpler matter and maintain properties
ion
atom or molecule with a charge
ionic bond
bond based on opposite charges
isotopes
atoms of the same elements with different numbers of neutrons
mass
the quantity of matter in an object
mass number
sum of protons + neutrons
matter
anything that has mass and take up space
molecule
simplest particle of a substance that retains all the properties of the substance
neutron
subatomic particle with a neutral charge (no charge)
nucleus
central region of an atom that makes up most of the mass
orbital
regions around nucleus where electrons can be found based on their energy
periodic table
chart which arranges element by increasing atomic number
proton
subatomic particle with a positive charge