Emma
the smallest unit of an element that retains the properties of that element
Atom
the radiation that goes from the cathode the the anode
Cathode ray
the negitively charged particals in atom
Electrons
a dense region in the atoms center containing almost all of its mass
Nucleus
a subatomic particle that has the mass of a proton but has no charge
Neutron
a subatomic partical that has the mass of a neutron but has a positive charge
proton
the number of protons in an atom
Atomic number
atoms with the same number of protons but different numbers of neutrons
isotopes
the sum of protons and neutrons in the nucleus of an atom
Atomic mass
1/2 the mass of an atom of carbon 12
Atomic mass unit (amu)
a prossec which some substances spontainuously emit radiation
Radioactivity
the rays an partical emitted by the radiactive material
radiation
the reaction that involves the change of an atoms necleus
Nuclear reaction
a prosses in which unstable nuclie loose enrgy by emitting radiation
Radioactive decay
alpha particals with a 2 plus charge are attracted to the negitive plate
Alpha radiation
beta particaks have a 1- charge and are attracted to the positive plate
Beta radiation