electron configuration for the element is - 1s² 2s² 2p⁶ 3s² 3p⁶
the number of electrons in an atom is equal to the number of protons
number of protons in an atom of an element is called the atomic number and the atomic number is characteristic for the atom
the number of electrons in the atom can be calculated from the electronic configuration - 2 + 2 + 6 + 2 + 6 = 18
since electrons = protons
number of protons of the atom is 18
we have to check the periodic table to see which element has an atomic number of 18
Ar is the element with an atomic number of 18.
Ar is the noble gas with the given electronic configuration
