Atoms Flashcards
Alpha Particle
made of two protons and two neutrons joined together (it is a helium nucleus)
Atomic Number
the number of protons in the nucleus
Beta Negative Particles
an electron that has been emitted from the nucleus
Beta Positive Particles
a positive electron that has been emitted from the nucleus
Half-life
the time taken for half the nuclei in a radioactive sample to decay
Ionisation
the removal of an electron from an atom or molecule
Isotopes
nuclei with the same number of protons but different numbers of neutrons
Mass Number
the total number of protons and neutrons in the nucleus
Neutron
a neutral particle in the nucleus
Nuclear fission
a reaction in which the nucleus of an atom splits into two or more smaller nuclei
Nuclear fusion
a reaction in which smaller nuclei are joined together to make one larger nucleus
Nucleon
a particle in the nucleus (proton or neutron)
Proton
a positively charged particle in the nucleus
Quark
smaller particles that makeup protons and neutrons
