matter, atoms, and elements

matter

anything that has mass and takes up space

made of atoms

atoms

building blocks / smallest unit of matter that has property of substance

what is the atomic structure is made up of…

protons - positive, 1, located in nucleus

neutrons - no charge, 1, nucleus

electrons - negative, 0 charge, and is located in the electron cloud

nucleus

center of the atoms that contains the mass of the atom (protons + nucleus)

electron cloud

region that surrounds the nucleus and contains all electrons

john dalton

came up with the atomic theory of matter (all matter is made up of atoms)

atomic number

protons in the nucleus of an element

• # of electrons = # of protons

• located on top of the element card

atomic mass

total # of protons and neutrons in an atom’s nucleus

what is the atomic number

protons

electrons are the same as

protons

isotopes

atoms of the same element w/ different # of neutrons

• different atomic MASSES but same atomic number

• same # of protons, same # neutron

ion

atom with a charge

if GAINED electrons, what kind of charge will it have?

NEGATIVE CHARGE

if LOST electrons, what charge will there be?

POSITIVE CHARGE

Elements

building blocks of matter

• made of atoms

• to make molecules you need elements