Question

7. a) Calculate the wave number of longest wave length transition in the Balmer series of
Hydrogen atom. (Rh=1.09X10'M')
b) Atomic number and mass number of an element are 29 & 64. How many proton and
Neutrons are present in it?
8. a) Explain the significance of four quantum numbers.
b) Write the orbital when n=3 and 1=1
9. a) Calculate the wave length of the spectral line of proton during transition from third
energy level to second energy level of hydrogen atom in Balmer series (Rh=1.09X10'M
b) Find the number of protons and neutrons in 2320
10. a) the atomic number and mass number of sulphure are 16 &32 respectively , find the
number of protons and neutrons.
b) Calculate the wave number of first spectral line appearing in Lyman series of hydrogen
atom (Rh= 109677 m*').
11. a) For the element with atomic number 29,
i) Write electronic configuration.
ii) Write the value of n and l for its electron in the valence shell.
iii) How many unpaired electrons are present in it.
b) Find the number of protons and neutrons in 56Fe
2. a) Calculate wave number and frequency of yellow radiation having wave length 5800Aº.
b) Mention the fundamental particles of an atom .​

Answer 1

protons are very useful