a particle with two protons and two neutrons with a 2+ charge
radiation that is made up of alpha particles
the smallest particle of an element that retains all the properties of that element
the weighted average mass of the isotopes of that element
atomic mass unit
one twelfth the mass of a carbon- 12 atom
the number of protons in an atom
a high-speed electron with a 1- charge that is emitted during radioactive decay
radiation made up of beta particles
a ray of radiation that originates from the cathode and travels to the anode of a cathode ray tube
Dalton's atomic theory
a theory proposed by John Dalton in 1808, based on numerous scientific experiments that marked the beginning of the development of modern atomic theory
a negatively charged, fast-moving particle with an extremely small mass
high-energy radiation that has no electrical charge and no mass, it is not deflected by electric or magnetic fields, usually accompanies, alpha and beta radiation
atoms of the same element with the same number of protons but different numbers of neutrons
the number after an element's name representing the sum of its protons and neutrons
a neutral subatomic particle in an atom's nucleus that has a mass nearly equal to that a person
a type of equation that shows atomic number and mass number of the particles involve
a reaction that involves a change in the nucleus of an atom
the extremely small, positively charged, dense center of an atom that contains protons
a subatomic particle in an atom's nucleus that has a positive charge of 1+
the rays and particles (alpha, beta, gamma) that are emitted by radioactive materials
a spontaneous process in which unstable nucleus lose energy by emitting radiation
the process in which some substances spontaneously emit radiation
the SI unit used to measure the amount of a substance (atom)
the mass in grams of one mole of any pure substance
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