Helium has an atomic mass of 4.00 atomic mass units. The gaseous element also has an atomic number of 2 and an atomic symbol of He. Its atomic number correlates with the number of protons and electrons the element has, w... More »

An atomic number assigned to an atom changes when the number of protons in the nucleus of the atom changes. By definition, the atomic number of an atom is the number of protons in the nucleus of the atom. More »

According to Elemental Matter, helium is a gaseous substance, and gases do not have texture. They do have other identifying qualities. Specifically, helium is a noble gas, which means that it is part of section 18 on the... More »

Atomic mass is the total mass of protons, neutrons, and electrons in a given element, commonly expressed in unified atomic mass units. The International Union of Pure and Applied Chemistry (IUPAC) has defined a unified a... More »

Helium has a molar mass of 4 grams per mole. It is the second element on the periodic table with an atomic number of 2. Helium has a very low density and is able to float through air because its density is far less than ... More »

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The molecular weight of bromine is about 79.90 atomic mass units. The atomic weight of an element such as bromine is located on the periodic table of elements below the element's symbol. For bromine, the symbol is Br. More »

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As of June 2014, the nine elements named after celestial bodies are Mercury, Uranium, Neptunium, Plutonium, Cerium, Palladium, Tellurium, Helium and Selenium. These names cover planets, asteroids and stars. In addition, ... More »

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