Name the atom of an element which has one electron, one proton and no neutron?Helium atomHydrogenCarbonNone of these

Which pair of atoms are isotopes of the same element?

molecules having only one atom in a element like helium and neon and argon

Any of the two or more atoms of the same element that have different numbers of neutrons

Isotopes of the same element have different?Aatomic numbersBnumbers of neutronsCnumbers of electronsDnumbers of protons

The element hydrogen is first on the periodic table, so its atomic number is 1.We can infer from this information that every hydrogen atom must have:one protonone electronone neutron