The ratio of the atomic number of two elements ‘A’ and ‘B’ is 2:3. 'A' is an inert gas with the first three orbits completely filled. Identify ‘A’ and ‘B’ and write their electronic configuration.

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Solution

'A' is an inert gas with the first three orbits completely filled. Its electron configuration will be [Ar] 3d¹⁰4s²4p⁶ or 1s² 2s²2p⁶3s² 3p⁶ 4s²3d¹⁰ 4p⁶.
The atomic number of ‘A’ is 36.
The ratio of the atomic number of two ‘A’ and ‘B’ is 2:3. so the Atomic number ‘B’ will be 54.
The element ‘B’ is Xenon and its electron configuration will be Electron configuration: [Kr]4d10 5s2 5p6 or 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶.

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