Are the basic building blocks of the matter that we see all around us.
a. electrons
b. chemicals
c. elements
d. compounds

The basic blocks of matter that we see around us are the elements, letter C. In an element, it contains protons, neutrons and electrons. The neutrons and protons are located inside the nuclei and the electrons surround the element. The electrons are also responsible for the sharing and gaining of other electrons that is why it can form compounds. A combination of elements is called compounds. And compounds have chemical names. For example, HCl or hydrochloric acid. It is a compound and the elements present in it are hydrogen and chlorine.

The masses of the objects and their densities