Helium (He) is a chemical element and inert gas belonging to the Periodic Table’s Group 18 (noble gases). Helium is the second lightest element (only hydrogen is lighter), and it is a colourless, odourless, and tasteless gas that turns into a liquid at a temperature of 268.9 degrees Celsius (452 degrees Fahrenheit). Helium has lower boiling and freezing points than any other known substance, making it the most energy-dense element. Helium has an atomic number of 2, which means that each atom of helium contains two protons.Helium is the only element that cannot be solidified by sufficient cooling under normal atmospheric pressure it requires the application of 25 atmospheres of pressure at a temperature of 1 K (272 degrees Celsius or 458 degrees Fahrenheit) in order to convert it to its solid state. The element’s most abundant isotope has two neutrons, making it the most abundant isotope. Helium has the lowest melting and boiling points of all the elements, and as a result, it can only exist as a gas except in extremely extreme circumstances.It is more energy efficient for each helium atom to have two electrons, which results in a more stable electron shell for the atom. Helium is a liquid at absolute zero pressure when under normal pressure. Helium is the second lightest element after hydrogen.It needs to be pressurised in order to solidify. Hydrogen is the lightest element, as well as the element with the lowest density. ![]() ![]() Despite the fact that hydrogen is typically found as a diatomic gas, consisting of two atoms that are bonded together, a single atom of helium has a higher density value than a single atom of hydrogen.
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