Question

Which state of be3+ has the same orbit radius as that of ground state h-atom

Answer 1

2nd state of the triply ionised beryllium(Be3+ ion) has the same orbit radius as that of ground state of hydrogen atom.

Answer 2

Answer:

2nd LEVEL OF Be3+

Explanation:

Radius of nth orbital,

          r = n²h²/4π²mKZe²

i.e.   $r$  is inversely proportional to n²/z

In HYDOGEN n=1,z=1

∴n²/Z=1.........................Eq1

In Be Z=4..........n²/Z=1  [From eq1]

∴n²=1×Z=1×4=4

⇒n=√4=2

∴$n=2$

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Hope it helps ...................:)