D. Chemical weathering
*i think .
Ca + H = CaH2
Calcium + Hydrogen = Calcium hydride
Balanced equation :-
Ca + 2H = CaH2
This tells us that an atom of sodium contains 11 electrons which is balanced by 11 protons. The atomic mass of the atom is then the sum of the protons and neutrons. If you know the atomic mass of sodium, you can subtract 11 (protons) to get the number of neutrons.
To me it appears to be pulled apart but I’m a little unsure.
