What atomic number of an element "X" would have to become so that the 4th orbit around X would fit inside the I Bohr orbit of H atom?

What atomic number of an element "X" would have to become so that the

1.	What atomic number of an element "X" would have to become so that the 4th orbit around X would fit inside the I Bohr orbit of H atom?
A.	3
B.	4
C.	16
D.	25
Answer» D. 25

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What atomic number of an element "X" would have to become so that the 4th orbit around X would fit inside the I Bohr orbit of H atom?

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