Mass of Mg=24g Number of moles in 0.004g=4/24000=1/6000 hence, number of atoms=(6.022*10^23)/6000 =6.022*10^20/6 3.011*10^20/3 10.026*10^19 atoms. read more
The number of atoms in 0.004g of magnesium is closed to (atomic mass of Mg =24 - 4179059 read more