Chem- Chapter 4

Beta radiation

radiation deflected towards the positively charged plate

Proton

subatomic particle has a positive charge

neutron

subatomic particle has a neutral charge

Rutherford

proposed the nuclear atomic model

nucleus

the center most part of an atom where the protons and neutrons are contained

electron

subatomic particle has a negative charge

radiation

the rays and particles emitted by radioactive material

atomic mass unit

equal to 1/2 the mass of a carbon-12 atom

radioactive decay

process (not requiring energy) by which unstable nuclei lose energy

isotope

one of two or more atoms with the same atomic number but with different numbers of neutrons

Dalton's atomic theory

states that all matter is composed of atoms

cathode ray

a beam of electrons emitted by the cathode of an electrical discharge tube

alpha radiation

radiation deflected towards the negatively charged plate

nuclear reaction

a reaction that involves a change in an atom's nucleus