Structure of Atom

Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is 1013 Hz (nearest integer). [Given : RH (Rydberg constant) = 2.18 10-18 J, h (Planck's constant) = 6.6 10-34 J. s.]

For hydrogen atom, energy of an electron in first excited state is -3.4 eV. K.E. of the same electron of hydrogen atom is x eV. Value of x is 10-1 eV. (Nearest integer)

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