The electronic configuration of an element is an arrangement of all of its electrons in various shells and gives an idea of the properties of the element. For writing the electronic configuration of an element, we need to know its atomic number.
The atomic number of element Barium is 56 and its electronic configuration can be written as:
`1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^10, 4s^2, 4p^6, 4d^10, 5s^2, 5p^6, 6s^2`
Thus, we can see that s, p and d orbitals are fully filled.
Barium is an element of Group II of the periodic table and belongs to the alkaline earth metals group. The same group contains calcium, magnesium, strontium, etc. All these elements have similar electronic configurations--that is a fully filled s-orbital--and all these elements have similar properties.
Hope this helps.
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