IMAT - International Medical Admissions Atomic Structure and Periodicity Questions and Answers

Question 1

An atom of the isotope chlorine-37 (³⁷Cl) contains which of the following combinations of subatomic particles?

Accepted Answer

17 protons, 20 neutrons, 17 electrons

Answer

17 protons, 20 neutrons, 18 electrons

Answer

20 protons, 17 neutrons, 20 electrons

Answer

17 protons, 37 neutrons, 17 electrons

Question 2

Which of the following elements has the highest first ionisation energy?

Accepted Answer

Neon (Ne)

Answer

Sodium (Na)

Answer

Oxygen (O)

Answer

Fluorine (F)

Question 3

What is the correct ground-state electron configuration for the iron(III) ion, Fe³⁺?

Accepted Answer

[Ar] 3d⁵

Answer

[Ar] 4s²3d³

Answer

[Ar] 4s¹3d⁴

Answer

[Ar] 4s²3d⁹

Question 4

An electron in an atom is described by a set of four quantum numbers. Which of the following sets of quantum numbers (n, l, m_l, m_s) is not permissible?

Accepted Answer

(3, 3, -2, -1/2)

Answer

(4, 0, 0, -1/2)

Answer

(2, 1, 0, +1/2)

Answer

(3, 2, -1, +1/2)

Question 5

Which of the following species, which are all isoelectronic with argon, has the largest radius?

Accepted Answer

S²⁻

Answer

K⁺

Answer

Ar

Answer

Cl⁻

Question 6

Which of the following covalent bonds is the most polar?

Accepted Answer

F-H

Answer

C-H

Answer

N-H

Answer

O-H