It is an odourless, tasteless and colourless gas and its electronic configuration is 3s23p6. Argon is denoted by Ar and it has an atomic mass of 18. It is the third element in group 18 in the noble gases periodic table. The gas is trapped within the rocks present in the earth’s crust. It is present in less quantity in the earth’s atmosphere. Neon is widely used in electrical signs and fluorescent lamps. Its melting point is -248.4☌ and its boiling point is -246☌. It has the electronic configuration of 2s22p6 and a density of 0.9 g/L. It is a colourless, odourless, tasteless and monatomic gas. The second element in the noble gases periodic table is neon which is denoted by Ne. It is generally concentrated in stars and is widely used for welding metals like aluminium. Helium comprises around 23% of the universe’s mass. Thus, Helium has 2 electrons in total in the valence shell. Helium’s atomic number is 2 and its electronic configuration is 1s2. Helium is the second lightest chemical element that is odourless, tasteless and colourless. Helium has the lowest boiling point amongst all of the noble gases and it is also the lightest gas in group 18. The first chemical element in group 18 is Helium which is denoted by He. We will now discuss some examples of noble gases in detail. It is important to note that most of the properties of noble gases are correlated to the atomic radii of atomic size. All of them are, however, poor heat conductors. This indicated that noble gases are chemically inert.Īll of the noble gas elements conduct electricity except neon. These noble gases have the most ionisation enthalpy in the periodic table. On moving top to bottom in a group of the periodic table, the ionisation energy keeps decreasing. However, as we move down the group, the density will increase again due to an increase in atomic size.Īs we move down the group from He to Rn, atomic size increases which result in an increase in the attractive force and thus, the polarity increases and ionisation potential decreases. However, as we move down the group, the melting and boiling point increases because of the increase in atomic size.Īll the noble gas elements have low densities. All of the noble gases have very low melting and boiling points. In normal conditions of atmospheric pressure and temperature, all the noble gas elements are in the gaseous state. This happens because as we move down the group, occupied shells increase in number. Moving down the group from He to Rn, the atomic radii or size increases. Here are some physical properties of noble gases: Atomic Size or Atomic Radii However, Xenon is an exception as it can form compounds with oxide or fluoride. They rarely react with any other elements because they have a low tendency of losing and gain electrons. They are very stable because these gases have a complete octet.They conduct fluorescence and electricity, which is necessary for certain conditions to sustain a stable environment.Noble gases have several chemical and physical properties, both of which are discussed below. Noble gases are monatomic gases because they don’t form molecules very easily because of their stable electronic configuration feature. ![]() Under normal conditions, these elements are in a gaseous state. They are present in group 18 of the periodic table. ![]() The word ‘noble gas’ is derived from a German word called ‘Edelgas’, which means noble gas. All noble gases are colourless, odourless, and monatomic gases with low chemical reactivity and stable electronic configurations. The noble gases, also known as inert gases, are a class of elements that have analogous properties.
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