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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Helium is an element of the periodic table that is composed of subatomic particles including protons, neutrons and electrons. The atomic number of helium is 2, which means it contains two protons and two electrons. The m... More »

Helium is a gas that is colorless, odorless and does not react with other elements under normal circumstances. Scientists classify helium as a noble gas. More »

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

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 sun produces heat and electromagnetic radiation as a product of the fusion of hydrogen nuclei into helium nuclei. The radiation produced covers most of the electromagnetic spectrum, including visible, ultraviolet and... More »

Of all the elements of the periodic table, helium is the least reactive. It does not react with water, acids, halogens, bases or air. More »