Both of these isotopes are stable and no radioactive decay can be observed. 4He is the most abundant form among them and its abundance is given as 99%. Since helium is a noble gas, it only shows zero oxidation state. This is because helium is an inert gas that will not undergo chemical reactions.
In the periodic table of elements, helium is categorized as an s block element but is placed in the right side corner of the table. This makes it a gas for a wider range of temperatures. The boiling point of helium is given as -268 oC. The melting point of helium is about -272.2 oC, which is a very low value. It exists as a monoatomic gas.įigure 1: Chemical Structure of Helium Atom Helium is considered as the second most abundant element in the universe. At room temperature and pressure, helium is a colorless and odorless gas. Therefore, the atomic mass of helium is 4.002602 amu. An atom of helium is composed of 2 protons and 2 neutrons in the nucleus along with 2 electrons in its 1s orbital. The electron configuration of helium is 1s 2. Helium is an element that has the atomic number 2 and is a gaseous substance. Key Terms: Atomic Mass, Atomic Number, Deuterium, Helium, Hydrogen, Isotopes of Helium, Protium, Tritium What is the Difference Between Helium and Hydrogen What are the Similarities Between Helium and HydrogenĤ.
– Properties, Isotopes, Reactions, and Applicationsģ. The main difference between helium and hydrogen is that helium atom exists as a monoatomic gas in the atmosphere whereas hydrogen exists as a diatomic gas in the atmosphere. Due to the very light weight of these gases, they are used to fill air balloons. Due to the characteristic features of hydrogen and helium, there are many applications of these gases in industry. Therefore, they are the smallest and lightest atoms on earth. Hydrogen and Helium are the first two elements that are found in the periodic table of elements.
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