Atoms

smallest unit of an element that still has the chemical properties of the element

atom

determines the element of the atom

atomic number

how many protons an atom has; element of the atom

atomic number tells

forms of an element with different numbers of neutrons

isotopes

number of neutrons plus protons

mass number

the number of electrons that can be held in the second orbit

eight

the part of the atom that carries an electric charge

electron

electrons are found in the

electron cloud

number of protons equals the amount of ________ and ______

electrons; atomic number

the part of the atom that carries a positive charge

proton

the number of electrons that can be held in the first orbit

two

center of atom that contains protons and neutrons

nucleus

neutrons are found in the

nucleus

protons are found in the

nucleus

the part of the atom that carries no electric charge

nucleus