The number of protons in the nucleus of an atom
An analogous transmutation of atomic nuclei or other particles
Exert a force on an object this is directed toward the source of the force
All existing matter and space
The smallest constituent unit of ordinary matter that consists a chemical element
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons
The sum of the masses of its isotopes, each multiplied by its natural abundance
A tabular display of the chemical elements
The fixed amount of energy that a system described by quantum mechanics, such as a molecule,atom, electron, or nucleus can have
The total number of protons and neutrons in a nucleus
A helium nucleus emitted by some radioactive substances
The self sustaining fission reaction by neutrons which occurs in nuclear reactors and bombs
A set of elements occupying a column in the periodic table
Reproduction by means of a cell or organism dividing into two or more new cells or organisms
A stable subatomic particle with a charge of negative electricity
A particle that forms part of the nucleus of an atom and carries no electric charge
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge
The positively charged central core of an atom
A substance introduced into a biological organism or other system so that it’s subsequent distribution can be readily followed from its color, fluorescence, radioactivity, or other distinctive property