Page 191 - The Periodic Table Book
P. 191
He
Ne
Ar
Kr
Xe
Rn
Og
Noble Gases
The group on the far right of the periodic table belongs to the noble gases.
These elements are described as “noble” because they do not react with
the other “common” elements, such as oxygen (O). Their atoms never
form bonds in nature, not even with atoms of their own kind, and so
they are always gases at room temperature.
Atomic structure Physical properties Chemical properties Compounds
Apart from a helium (He) All the members of this group Noble gases never react in These gases form no natural
atom that has two electrons are colourless gases. Going nature. In the laboratory, compounds. However, xenon
in its outer shell, all other down the group, the density heavier noble gases (Xe), krypton (Kr), and argon
elements in this group have increases – radon (Rn) is 54 can be forced to form (Ar) can be made to
atoms with eight electrons. times denser than helium. compounds with fluorine (F). form compounds.
188-189_Noble_Gases_Opener.indd 189 02/12/16 6:52 pm
