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A gram atomic mass of helium (He) contains the same number of atoms as 1 mole of helium. Since 1 mole of any substance contains approximately 6.022 x 10^23 atoms, a sample of helium with a gram atomic mass would contain that same number of atoms.
Yes, all carbon atoms have the same atomic number, and that is 6.
Atomic Mass
it represents where the atoms, protons, Atomic Mass, atomic number, and electrons where they are located on the nucleus.
Two atoms are isotopes if they have the same number of protons but different numbers of neutrons in their atomic nuclei. This results in atoms of the same element having different atomic masses.