The smallest unit of a compound in which two or more atoms are joined chemically together Molecule.
A. Energy
B. Organism
C. Chemical reaction
D. Matter
E. Cellular respiration

Rn in the right answer

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

Solubility would be your answer.

C. chemical changeshope i : )