quarks definition by Wordo

Noun

In

the

Standard Model

,

one

of

a

number

of

elementary

subatomic particles

having

fractional

electric charge

that

forms

matter

.

They

are

theorized

not

to

exist

in

isolation

,

but

only

in

combinations

in

hadrons

such

as

neutrons

and

protons

or

in

gluon plasmas

.