Which of the following statements about the electron is incorrect?

The energy of electron in first energy level is -21.79 × 10^-12erg per atom. The energy of electron in second energy level is:

Zeeman effect refers to the :

splitting up of the lines in an emission spectrum in the presence of an external electrostatic field
random scattering of light by colloidal particles
splitting up of the lines in an emission spectrum in a magnetic field
emission of electrons from metals when light falls upon them

Solution

Zeeman effect refers to splitting of lines of an emission spectrum in magnetic field.

Correct set of four quantum numbers for valence electron of rubidium (Z = 37) is

Identify the correct statement:

Solution

Those orbitals which are equal in energies are called degenerate orbitals. All sp³ orbitals are degenerate as these are equal in energies.

The first emission line of hydrogen atomic spectrum in the Balmer series appears is (R = Rydberg constant)

Solution

\(\Delta E = R \left( \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}} \right)\)

First line in Balmer series results in the transition : n₂ = 3 to n₂ = 2.

Pick out the isoelectronic structure from the following:

(i) \(\overset{+}{C}H_{3}\)

(ii) \(H_{3}\overset{+}{O}\)

(iii) \(NH_{3}\)

(iv) \(\overset{-}{C}H_{3}\)

The allowed values of m for 1 = 2 is

Solution

For every l, quantum number 'm' can take values from –l to+l. So for l = 2, m = –2, –1, 0, +1, +2

Which of the following transitions of electrons in the hydrogen atom will emit maximum energy ?

Solution

ΔE for two energy levels \(21.79 \left( \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}} \right)\) J/atom

According to Bohr’s theory,the angular momentum of an electron in 5th orbit is

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