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group 18 elements are called noble gases why
group 18 elements are called periodic table
group 18 elements are known as the and have full valence shells
why group 18 elements are called inert gases
13 to 18 group elements are called
group 18 elements are also called
the group 8a (18) elements are called the ___
group 18 elements which are generally unreactive are called
elements of group 18 are called zerovalent