1
The number of protons in the nucleus of an atom
2
An analogous transmutation of atomic nuclei or other particles
3
Exert a force on an object this is directed toward the source of the force
5
All existing matter and space
7
The smallest constituent unit of ordinary matter that consists a chemical element
8
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons
9
The sum of the masses of its isotopes, each multiplied by its natural abundance
11
A tabular display of the chemical elements
13
The fixed amount of energy that a system described by quantum mechanics, such as a molecule,atom, electron, or nucleus can have
14
The total number of protons and neutrons in a nucleus
15
A helium nucleus emitted by some radioactive substances
18
The self sustaining fission reaction by neutrons which occurs in nuclear reactors and bombs
19
A set of elements occupying a column in the periodic table
20
Reproduction by means of a cell or organism dividing into two or more new cells or organisms
23
A stable subatomic particle with a charge of negative electricity
24
A particle that forms part of the nucleus of an atom and carries no electric charge
25
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge
26
The positively charged central core of an atom
27
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