why does inert gases placed in zero group
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because all their shells are filled completely so they are called zero group
Siddheshkitkaru:
Inert gases or noble gases have already completed their octet (zero velency) an hence are stable and do not react with other elements or make any compounds. Hence, it makes a lot sense that they are placed in group zero
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Inert gases (“noble gases”) already have their full complement of electrons in their outer shell. They do not need to bond to fill their outer shell of electrons. So, they are most stable atoms in the periodic table and are found as individual atoms in nature. The smallest (and the most stable) is Helium (He). You will not find ANY helium compounds. However, it is possible to react certain very reactive atoms with the larger noble gases, e.g. Xe and Kr. So you can form XeF2, XeF4 and XeF6 and XeO3. Radon forms even more of these compounds since its outer shell is a LONG way from the nucleus.
It therefore makes a lot of sense to group all of these gases in “group zero”
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