Which of the following compounds has only one atom of carbon?
a. co2
b. hci
c. c2h6
d. c2h2

CO2

Explanation:

Well C2H6 there are 2 carbon and 6 hydrogen atoms

and having no number on the right of the letter means there is only one atom

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.