What property identifies two atoms as isobars?

1.	They have the same atomic number but different mass numbers.
2.	They have the same number of electrons but a different number of neutrons.
3.	They have the same number of neutrons but different numbers of electrons.
4.	The sum of the number of protons and neutrons is the same but the number of protons is different.

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

Total number of orbitals associated with third shell will be:

1. 2

2. 4

3. 9

4. 3

Orbital angular momentum depends on which quantum number?

1.  l

2.  n and l

3.  n and ${\mathrm{m}}_{\mathrm{l}}$

4.  ${\mathrm{m}}_{\mathrm{l}}$ and ${\mathrm{m}}_{\mathrm{s}}$

Which ratio of Cl-37 to Cl-35 is approximately consistent with the average atomic mass of chlorine being 35.5, given that chlorine exists as two isotopes Cl-35 and Cl-37?

1. 1:2

2. 1:1

3. 1:3

4. 3:1

Which pair of ions has the same electronic configuration?

For the electrons of an oxygen atom. The correct statement among the following is :

Identify the matter waves with the shortest wavelength when traveling at the same speeds :