All of the elements with the exception of hydrogen have neutrons. So yes there is one element that doesn't need neutrons to be stable, the rest need them.
Hydrogen
Yes. Atoms with a different number of neutrons are called isotopes of that atom, but a variation in the number of neutrons does not change what the atom is.
an isotope is defined by an atom with the same number of protons, but a different number of neutrons
no, atoms don't have to have neutrons, neutrons are supposed to be neutral so it wont change the charge of the atom if you add or subtract neutrons from an atom. what will change is the mass number of the atom.
Yes. Most hydrogen atoms do not contain neutrons. All other atoms do.
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Neutrons are found in the nucleus of an atom along with protons. They have no electrical charge and help stabilize the nucleus by adding mass without affecting the atom's overall charge.
The neutrons and protons are found in the nucleus of the atom. Along with electrons, they are the subatomic molecules that make up the atom. FYI an atom is the smallest piece of matter that still maintains its identity and properties
Neutrons add mass and stability to an atom by increasing the atomic weight without changing the chemical properties. They also help to hold the nucleus together by balancing the repulsive forces between protons.
When neutrons do not add to the charge of an atom, the number of protons remains the same, so the atomic number stays constant. However, the mass number of the atom increases because neutrons contribute to the mass of an atom without affecting its charge.
Neutrons
Hydrogen is the only element without any neutrons.