```Problems with Solutions
True and False
Problem:
All electromagnetic radiations have same energy.
Solution:
False.
Different electromagnetic radiation have different wavelengths, hence different energy

Problem:

Bohr’s model is applicable for H-atom only.

Solution:

False.
Bohr’s model is applicable for species having one electron like H, He+, Li2+.

Problem:

Specific charge of cathode rays remains same irrespective of the gas used in the discharge tube.

Solution:

True.
Cathode rays contain electrons which remains same with every gas.

Problem:
Isoelectronic species have same electronic configuration.
Solution:
True.
Isoelectronic species have same number of electrons.

Problem:
Atoms with same atomic number but different number of neutrons are called isotopes.

Solution:

True.
Isotopes have same atomic number but different atomic mass.

Fill in the Blanks
Problem:
The mass of positron is ___________ electron.

Solution:

Equal to

Problem:
With increasing principle quantum number, the energy difference between adjacent energy levels in H-atom _________.
Solution:
Decreases

Problem:

If the magnetic moment of an ion An+ is 5.9, then the number of unpaired electrons present in An+are ____________
Solution:
Five. Applying µ = √n(n+2), where n = 5

Problem:
s-electrons are more penetrating than p-electrons. The energy required to abstract s-electrons is ____________ than for p electrons.
Solution:
Greater

Problem:

The wavelength of the first spectral line in Paschen series for H-atom is____________
Solution:
16410 Å
For Paschen seriesn2=4, n1 = 3 ```
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