Structure of Atom

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

The correct set of four quantum numbers for the valence electron of rubidium atom (Z=37) is :

1. 5, 1, 1, + 12
2. 5, 0, 0, + 12
3. 5, 0, 1, + 12
4. 5, 1, 0, + 12

Match List I with List II Choose the correct answer from the options given below:

1. A-II, B-IV, C-III, D-I
2. A-I, B-III, C-II, D-IV
3. A-II, B-III, C-I, D-IV
4. A-I, B-II, C-III, D-IV

The number of electrons present in all the completely filled subshells having n = 4 and s = + 12 is . (Where n = principal quantum number and s = spin quantum number)

Total number of ions from the following with noble gas configuration is . Sr2+ (z = 38), Cs+ (z = 55), La2+ (z = 57), Pb2+ (z = 82), Yb2+ (z = 70) and Fe2+ (z = 26)