The discovery that helium and iron can mix at the temperatures and pressures found at the center of Earth could settle a long ...

On Earth, helium comes in two stable isotopes. By far the most common is helium-4, with a nucleus containing two protons and ...

Deuterium (heavy hydrogen), for instance, has one proton and one neutron in its nucleus. When two deuterium nuclei are fused together, they form a helium nucleus (two protons and two neutrons ...

So in the helium example, there would be four protons and two electrons in the nucleus to yield a mass of 4 but a charge of only 2. Rutherford also put out the idea that there could be a particle ...

The discovery that helium and iron can mix at the temperatures and pressures found at the center of Earth could settle a long-standing debate over how our planet formed. Primordial helium from the ...

This rare form of helium is called helium-3 because it has two protons and one neutron in its nucleus. Normal helium, which is 700,000 times more common than helium-3, is called helium-4 because ...