Write the electronic configuration of ${}_{18}C$ .Find out C is a metal, non metal or inert gas.

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Solution

Given the atomic number of C is 18.
Atomic number is the number of protons in an atom. In an electrically neutral atom, number of electrons and protons will be same.
Thus C will have 18 electrons and hence the electronic configuration: 2,8,8.
C has completely filled valence shell with 8 electrons. Hence C will be chemically inactive and called as a noble gas .
Noble gases are elements of group 18 of the periodic table..

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