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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In every instance where an unstable isotope undergoes radioactive decay, one or more atoms with a different number of protons than the decaying atom are created. According to the Purdue University College of Science Chem... More »

A beta particle is made up of a positron or an electron that has been emitted when an atom undergoes beta decay. Beta particle emission is different from alpha and gamma radiation, which consist of helium nuclei and high... 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 »

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