1.

The sum of all the quantum numbers of all the A valence electrons of an atom of an inert gas is 22. Identify the inert gas

Answer»

Solution :A SPHERICAL orbital that has three nodal regions and contain a pair of electrons is `4s^2`. Since this is the only orbital of that MAIN energy level that is occupied with electron, the valence SHELL is 4. All the penul- timate shells are completely filled. Therefore, the electronic configuration is `[Ar]3d^(10)4s^2` Therefore, the atomic NUMBER of that element is 30


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