Answer:
answers number 1
Explanation:
MgBr2
(Mg^2+) + (Br^1-)
For every Mg we need 2 Br to balance out the compound.
=7.89013× 10^47 moles of zinc
1 atom contains 6.023×10^23 moles.
1.31×10^24 atoms of zinc contain6.023×10^24×1.31×10^.24
The answer should be; 11
The atomic mass number is found by combining the number of protons and neutrons
Hope this helps :)
