What is the maximum number of electrons that can occupy the third main energy level (n=3) in an

atom?

A. 6

B. 8

C. 18

D. 32

Which of the following best describes the shape and orientation of a p atomic orbital?

A. Spherical shape.

B. Dumbbell shape in three orientations.

C. Cloverleaf shape.

D. Linear shape.

What principle is applied to determine the electron configuration of atoms?

A. Hund’s rule.

B. Pauli exclusion principle.

C. Aufbau principle.

D. All of the above.

How many orbitals are there in a d sublevel?

A. 1

B. 3

C. 5

D. 7

Which of the following is an exception to the general pattern of electron configurations?

A. Helium (He)

B. Carbon (C)

C. Chromium (Cr)

D. Neon (Ne)

What is the significance of the first ionization energy in an atom?

A. It indicates the atom’s ability to gain electrons.

B. It measures the energy required to remove the most loosely bound electron from a neutral

atom.

C. It determines the atom’s electrical conductivity.

D. It represents the energy needed to add an electron to an atom.

What does the Aufbau principle state about electron configuration?

A. Electrons fill orbitals starting with the highest energy level.

B. Electrons enter orbitals of lowest energy first.

C. Electrons in the same orbital must have the same spin.

D. Electrons fill each orbital before pairing up in any orbital.

In a hydrogen atom, transitions of an electron from higher energy levels to the second energy level

produce light in which region of the electromagnetic spectrum?

A. Ultraviolet

B. Visible

C. Infrared

D. Microwave

The electron configuration of an element in the second period of the periodic table typically ends in:

A. 1s

B. 2s

C. 2p

D. 3s

How many electrons can the f sublevel hold at maximum?

A. 2

B. 6

C. 10

D. 14