A carbon atom can bond to four other atoms because it has

a. four different cations.

c. two inner energy levels.

b. four valence electrons.

d. no protons in its nucleus.

Option C is correct.

Explanation:

A carbon atom can bond to four other atoms because it has four valance electrons. To fill these four valance electrons the carbon atom have to bond with other four atoms. The bond forms by carbon atom are the covalent bonds. These covalent bonds are the chemical bonds.

The simple example of carbon covalent bond is methane. In the methane a carbon atom bonds with four hydrogen atoms. these bonds are the chamical bonds namely covalent or chemical bonds.

Thus option C is correct.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

a electronegativity decreases beacuse the size of nucleus is bigger.