Answer:
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Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat.
You didn't attach the figure. Your text is incomplete. And you never got around to asking a question. Other than that, we're on it.
The electrons contribute just about zero to the mass of an atom.
It takes more than 1,800 electrons to make the mass of one
proton or neutron.
The naturally occurring element with the most complex atom is
Uranium. That's element #92 , so a neutral uranium atom has
92 electrons. It would take almost exactly 20 times that many
electrons to add the mass of one proton or neutron to the atom!
(And no other element has that many electrons in an atom of it.)