Select the correct answer
when phillip analyzed an unknown substance x, he found that it contained only one kind of atom. phillip was unable to convert the substance to
a simpler one. what is substance x?
oa. a compound
ob. an element
c. a heterogeneous mixture
od. a homogeneous mixture

B. an element

Explanation:

An atom is smallest indivisible particle that takes part in a chemical reaction. Different atoms due to the number of their protons called atomic number gives an element. Every element is a singular atom on it's own. Combination of atoms leads to the formation of molecules and compounds.

When compounds mix together without an actual chemical change, a mixture forms.

Elements are distinct substances that cannot be split up into simpler substances. They are usually made up of only one kind of atom.