Structure of Atom

The value of Rydberg constant (RH) is 2.18 10-18 J. The velocity of electron having mass 9.1 10-31 kg in Bohr's first orbit of hydrogen atom = 105 ms-1 (nearest integer).

In an atom, total number of electrons having quantum numbers n = 4, |ml| = 1 and ms = - 12 is .

The de-Broglie's wavelength of an electron in the 4th orbit is 0. (a0 = Bohr's radius)

The maximum number of orbitals which can be identified with n = 4 and ml = 0 is .

According to the wave-particle duality of matter by de-Broglie, which of the following graph plot presents most appropriate relationship between wavelength of electron ( ) and momentum of electron (p)?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

The number of radial node/s for 3p orbital is :

1. 3
2. 2
3. 1
4. 4

The ionization energy of sodium in kJ mol-1, if electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom is .

The four quantum numbers for the electron in the outermost orbital of potassium (atomic no. 19) are

1. n = 3, l = 0, m = 1, s = + 12
2. n = 4, l = 0, m = 0, s = + 12
3. n = 2, l = 0, m = 0, s = + 12
4. n = 4, l = 2, m = -1, s = + 12

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are false
4. Both Statement I and Statement II are true

Number of spectral lines obtained in He+ spectra, when an electron makes transition from fifth excited state to first excited state will be