Answer:
Step-by-step explanation:
MgO has 2 atoms
Rb2S has 3 atoms
Ca(OH)2 has 1 + 2 + 2 = 5 atoms
K2SO4 has 2 Ks 1S + 4Os = 6 atoms
Ga2(CO3)^2 has 2Ga + 2Cs 3*2O = 2 + 2 + 6 = 10 atoms
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