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

1.	Overall neutrality of atom
2.	Spectra of a hydrogen atom
3.	Position of electrons, protons, and neutrons in an atom
4.	Stability of atom

What property identifies two atoms as isobars?

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 _______.

1.  l

2.  n and l

3.  n and ${\mathrm{m}}_{\mathrm{l}}$

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

Chlorine exists in two isotopic forms, Cl-37 and Cl-35, but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately:

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 :