unit 2 Flashcards
who published the first atomic theory of matter
john dalton
what was the first atom model
solid sphere model
what was the second atom model
plum pudding model
who discovered electrons
J.J. Thompson
who discovered the charge of an atom using the oil drop experiment
robert milikan
what was the third atom model
nuclear model
who made the plum pudding model
J.J. Thompson
who made the nuclear model
Ernest Rutherford
who discovered the nucleus using the gold foil experiment
Ernest Rutherford
what is an element
the simplest form of matter
what is an atom
the smallest particle of an element that retains the chemical nature of an element
protons and neutrons have the same what
mass
how do you find neutrons
atomic mass - protons
protons equal what
atomic number
what does subatomic mean
smaller than an atom
what is an ion
an atom that has lost or gained an electron, giving it a charge
what is a cation
positive charge, lost electrons
what is an anion
negative charge, gained electrons
what is an isotope
atom of the same element with a different number of neutrons
how do you find weighted atomic mass
(abundance 1x mass 1)+( abundance 2 x mass 2)….
what unit is used form atomic mass
amu
what is fusion
combination of smaller nuclei to make a larger one, releases energy
what is fission
splitting of a large nuclei into 2 or more fragments, releases energy
all nuclei with more than 83 protons are what
unstable
