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Only hydrogen has un-isotopic atoms without a neutron. Hydrogen can sometimes though have one or so neutrons in its isotopes. The other elements must have neutrons to keep the protons from repelling each other in the atom's nucleus.
yes (except for the two isotopes of hydrogen).
EVERYTHING except hydrogen is denser than helium.
Apart from a few, almost all elements have isotopes. They are almost similar except the number of neutrons they have.
an isotope is a different form of that element. They just have different mass numbers/ atomic mass. Therefore having the same characteristics of the atom except for an increased/decreased number of neutrons. Isotopes have the same atomic number as each other.