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isotopesHelium-4 and helium 3 are isotopes and each have 2 protons. Helium 3 only has 1 neutron, while helium 4 has 2 neutrons.
helium = 4 molar mass
Yes, they are isotopes of helium
0.46 divided by the formula weight of helium (4)
0.46/4=0.115 or 0.12 moles of Helium
There are two variants of helium -- helium 3 and helium 4. Helium 4 is not magnetic but helium 3 is. Its magnetism is, however, of different nature than e.g. that of iron. The magnetism of helium 3 is used for medical lung imaging.