Answer
Atom is the smallest unit of element;
Element is a matter that is composed of one kind of atom;
Molecule is two or more atoms combined together;
Compound is two or more kind of atoms combined;
$H_{2}0$ - M, C;
$O_{2}$ - E, M;
Salt- M, C;
Sulfur- A, E;
$CH_{4}$ - M, C;
Sodium - A, E;
Glucose- M, C;
$H_{2}$ - E, M;
Chlorine- A, E;
Work Step by Step
Atom is the smallest unit of element;
Element is a matter that is composed of one kind of atom;
Molecule is two or more atoms combined together;
Compound is two or more kind of atoms combined;
$H_{2}0$ - M, C;
$O_{2}$ - E, M;
Salt- M, C;
Sulfur- A, E;
$CH_{4}$ - M, C;
Sodium - A, E;
Glucose- M, C;
$H_{2}$ - E, M;
Chlorine- A, E;
