Such a substance is always an element.
element
Most matter doesn't exist as individual atoms. Inert or "noble" gasses like helium and argon excepted, most matter exists in molecules that are composed of two or more atoms. Even pure oxygen isn't individual atoms; oxygen is the O2 molecule composed of TWO oxygen atoms. Except within the cores of stars, hydrogen, the most common element, normally exists as the H2 hydrogen molecule. So in general, matter is composed of molecules, which are composed of atoms.
Fermion
Matter is composed of atoms, which form elements and compounds, which may form mixtures.
John Dalton
1)One problem with his atomic theory was that it claimed that all matter is composed of tiny indivisible atoms. We now know that atoms are divisible and are composed of smaller, subatomic particles (electrons, protons, and neutrons). 2)He also stated that atoms of an element are identical in mass- this is incorrect because all elements have isotopes (atoms with this same proton number but different numbers of neutrons) which means that atoms of an element do not have to have the same mass.
Sounds like an element to me.
Yes, an element is composed of millions of identical atoms.
All matter is composed of atoms, and all atoms are composed of protons, neutrons, and elections.
The ATOMIC THEORY states that all matter is composed of very small particles called atoms, and that those atoms cannot be broken apart.
All matter
atoms
Yes, all matter is composed of atoms.
Yes. All matter is composed of atoms.
That all matters are made up of atoms
These are atoms of an isotope.
It's Atoms
Robert Boyle