atomic

As adjectives the difference between atomic and undefined

is that atomic is atomic while undefined is lacking a definition or value.

As an adjective atomic

is atomic.

As a noun range is

homework.

As adjectives the difference between singular and atomic

is that singular is being only one of a larger population while atomic is of or relating to atoms.

As a noun singular

is a form of a word that refers to only one person or thing.

As adjectives the difference between atomic and triatomic

is that atomic is atomic while triatomic is consisting of three atoms.

As a noun radiation

is the shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat.

As an adjective atomic is

atomic.

As adjectives the difference between elemental and atomic

is that elemental is (chemistry) of, relating to, or being an element (as opposed to a compound) while atomic is atomic.

As a noun elemental

is (fantasy) a creature (usually a spirit) that is attuned with, or composed of, one of the classical elements: air, earth, fire and water they sometimes have unique proper names and sometimes are referred to as air, earth, fire, or water.

As an adjective atomic is

atomic.