Can someone please tell me which atoms these are?

The atomic number is the number of protons is the atomic number. In a neutral atom this number is also the number of electrons. In the molybdenum example above all of these numbers are 42. Protons and neutrons each have a mass of one and electrons a mass of zero.

How this helps

They are right.
It worked for me

Your answer is c. explanation: plasma  is the fourth state of matter, derived from the gaseous state of matter.  plasma  can contain free  electrons  and/or  ions. while  plasma is never neutral, it can either be positively or negatively charged.  gases, however, are electrically neutral.