The nucleus of helium contains two neutrons and two protons. Around the nucleus of helium there are two electrons in the 1s orbital. These have opposite spins. More »

The element neon has exactly 10 neutrons. The element also has 10 protons and 10 electrons. It has an atomic number of 10 and an atomic mass of 20.18 atomic mass units. More »

One atom of helium has two protons in its nucleus. A neutral atom of helium also has two electrons. More »

One atom of helium has two protons in its nucleus. A neutral atom of helium also has two electrons. More »

Helium results from the fusion of four hydrogen nuclei to form one helium nucleus. This reaction also generates energy and is the source of power at the core of stars. More »

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The Bohr model of carbon has a central nucleus containing six protons and six neutrons, encircled by an inner orbit of two electrons and an outer orbit of four electrons. The two orbits represent different energy levels ... More »

Isotopes of the same element differ in the number of neutrons contained within the nucleus of the element's atoms, which causes them to differ in their atomic weights. Some isotopes are more radioactive and unstable than... More »