That sounds like hydrogen!
Hydrogen
The most abundent isotope of Hydrogen has only a proton for a nucleus with a single electron orbiting it. However some isotopes of Hydrogen do have neutrons in the nucleus.
Isotopes of a element are simply versions of that same element with different count of neutron, with that in mind they take all of the isotopes of a specific element and average them together taking in account the percent abundance of each so the most common isotope is the one on the periodic table.
The most electronegative element is fluorine. Its electron configuration is 1s2 2s2 2p5.
All isotopes of an element have the same number of protons. When they are not ionic, they have the same number of electrons. And, for all practical purposes, they behave identically as chemicals. share most of the same physical properties, and chemical properties. They have different number of neutrons.
Hydrogen
silicon
By weight or by number of atoms? By number of atoms
The isotopes 252Cf and 251Cf.
The earthworm
Tin or Stannum with 10 stable isotopes
It has 10
The most abundent isotope of Hydrogen has only a proton for a nucleus with a single electron orbiting it. However some isotopes of Hydrogen do have neutrons in the nucleus.
Isotopes of a element are simply versions of that same element with different count of neutron, with that in mind they take all of the isotopes of a specific element and average them together taking in account the percent abundance of each so the most common isotope is the one on the periodic table.
neutrons
The known weighted-averagemass of all the naturally occurring* isotopes for an element is the atomic mass of the element.____________________*This is not the same as "all the known isotopes", becausemost elements have known isotopes that are not naturally occurring.
The most electronegative element is fluorine. Its electron configuration is 1s2 2s2 2p5.