Question

The electron orbits with principal quantum numbers n > 3 were not allowed, the number of possible elements would be  

Solution

Correct option is

28

The maximum number of electrons that can be accommodated in orbits with n = 3 is  

         

         = 28.

SIMILAR QUESTIONS

Q1

The total energy of the electron in the first excited state of hydrogen is –3.4 eV. What is the kinetic energy of the electron in this state?  

Q2

The energy of the electron of hydrogen orbiting in the stationary orbit of radius rn is proportional to

Q3

The energy required to excite a hydrogen atom from n = 1 to n = 2 energy state 10.2 eV. What is the wavelength of the radiation emitter by the atom when it goes back to its ground state?

Q4

The ionisation potential of the hydrogen atom is 13.6 eV. Its energy in n = 2 energy state is

Q5

The innermost orbit of the hydrogen atom has diameter of 1.06 Å. What is the diameter of the tenth orbit? 

Q6

The difference lines in the Lyman series have their wavelengths lying between

Q7

The shortest wavelength in the :Lyman Series is 911.6 Å. Then the longest wavelength in the Lyman’s Series is 

Q8

Which of the following transition in a hydrogen atom emits the photon of lowest frequency?  

Q9

How many times does the electron go around the first Bohr orbit in one second? 

Q10

According to Bohr’s theory, the energy of an electron in the nth orbit of an atom of atomic number Z is proportional to