at n=5 , total electrons = 50 which implies that total electrons from n=1 to n=5 is 110
Pranav, the question is to find radius of the highest orbit assuming Bohr's model holds true. according to electron filling rule... 2, 8, 18, 32, (remaining = 40). we can see that principle quantum number is 5 counting these terms.
And in writing radius in Bohr's model, we just need n and Z.
Hope you understand it.Let me know if you have further doubt.
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