Which of the following conclusions could not be derived from Rutherford's $\mathrm{\alpha }$-particle scattering experiment?

Which of the following options does not represent ground state electronic configuration of an atom?

1. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{8}4{\mathrm{s}}^2$

2. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{9}4{\mathrm{s}}^2$

3. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}4{\mathrm{s}}^1$

4. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{5}4{\mathrm{s}}^1$

The probability density plots of 1s and 2s orbitals diagrams are given below

The density of dots in a region represents the probability density of finding electrons in the region.

On the basis of the above diagram which of the following statements is incorrect?

Which of the following statement is not correct about the characteristics of cathode rays?

Which of the following statements about the electron is incorrect?

1. It is a negatively charged particle

2. The mass of electron is equal to the mass of neutron

3. It is a basic constituent of all atoms

4. It is a constituent of cathode rays

Correct statement about the properties of the atom explained by the Thomson
model of an atom is:

Two atoms are said to be isobars if:

The number of radial nodes for 3p orbital is ______.

1. 3

2. 4

3. 2

4. 1

The number of angular nodes for 4d orbital is -

1. 4

2. 3

3. 2

4. 1

Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?

1. Pauli's exclusion principle

2. Heisenberg's uncertainty principle

3. Hund's rule of maximum multiplicity

4. Aufbau principle