1

### IIT-JEE 1990

Subjective
According to Bohr's theory, the electronic energy of hydrogen atom in the nth Bohr's orbit is given by ${E_n} = {{ - 21.6 \times {{10}^{ - 19}}} \over {{n^2}}}J$. Calculate the longest wavelength of light that will be needed to remove an electron from the third Bohr orbit of the He+ ion.

2055 Å
2

### IIT-JEE 1985

Subjective
What is the maximum number of electrons that may be present in all atomic orbitals with principal quantum number 3 and azimuthal quantum number 2?

10
3

### IIT-JEE 1985

Subjective
Give reasons why the ground state outermost electronic configuration of silicon is:

Solve by yourself
4

### IIT-JEE 1984

Subjective
The electron energy in hydrogen atom is given by E = (-21.7 $\times$ 10-12)/n2 ergs. Calculate the energy required to remove an electron completely from the n = 2 orbit. What is the longest wavelength (in cm) of light that can be used to cause this transition?

5.42 $\times$ 10-12 ergs, 3.67 $\times$ 10-5 cm

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