The law of conservation of mass follows from the concept that

a. atoms are indivisible.
b. atoms of different elements have different properties.
c. matter is composed of atoms.
d. atoms can be destroyed in chemical reactions.

"The law of conservation" is about how under the same condition of pressure and tempersture the number of atoms is constant.

Also, the fact that atoms have different properties,( as indivivisible as they may seem they have different potentials for forming molecules) is true.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )