Magnesium and iron are metallic elements. how does a mole of magnesium compare with a mole of iron?
a) a mole of iron has more atoms.
b) they both have the same mass.
c) a mole of magnesium has more mass.
d) they both have the same number of atoms.

d) They both have the same number of atoms.

Explanation:

A mole is defined as the amount of substance that contains Avogardro number of the substance. Avogadro's number is given by .

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number

Thus 1 mole of magnesium and iron both contains particles.