Radioactivty
The rays and particles emitted by radioactive material.
What is radiation?
The first four elements Greek philosophers thought of.
What is Fire, Water, Earth, and Air?
The number of protons in an atoms nucleus
What is atomic number
A neutrally charged subatomic particle.
What is a neutron?
A reaction that changes an atom's nucleus.
What is a nuclear reaction?
The law that states matter can't be destroyed or created.
What is the Law of Conservation?
An atom with extra electrons
What is an anion
A tiny dense region in the center of the atom.
What is the nucleus?
Unstable nuclei lose energy by emitting radiation in a spontaneous process.
What is radioactive decay?
The first person to propose the idea that matter was not infinitely divisible.
Who is Democritus?
This determines an atoms reactivity
What are valence electrons
He created an experiment where a narrow beam of alpha particles was aimed at a thin gold sheet.
Who is Rutherford.
A radiation particle that contains two protons and two neutrons.
The person who criticized Democritus.
Who is Aristotle?
Atoms with the same protons but different mass
What are isotopes
A model of the atom proposed by J.J. Thomson
What is the Plum Pudding Model?
A neutral radiation with no mass and isn't deflected by electric or magnetic fields.
What is a gamma ray?
The theory that states in a chemical reaction, atoms are separated, combined, or rearranged.
What is Dalton's Atomic Theory?
What the average atomic mass depends on
What is relative abundance of isotopes
1.007276 is the mass
What is a proton?