The designations s, p, d, f designate different types of electrons. a. valence electrons. b. different electron energy levels. c. different electron orbitals within an energy level.

C

Explanation:

The electrons in an atom are specifically housed in locations that could be referred to as shells. These shells are the places where we can find an electron.

Now, within each shell, we have different energy levels in which these occupants electrons occupy. These energy levels have different energies and the amount of electrons they can take.

For example, the number of electrons S can take is 2 while that in which d can take is 10

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

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

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock