MDCAT 2026 MCQs

An anion forms when electrons are gained.
It has more electrons than protons.

Electronegativity helps predict bond polarity.
Fluorine has the highest common electronegativity.

Rutherford concluded that atoms contain a small dense positive nucleus.
Most atomic volume is empty space.

Valence electrons largely determine chemical reactivity.
Elements in a group often share similar valence configurations.

Thomson's cathode-ray experiments revealed negatively charged particles.
He proposed an early model with electrons in positive matter.

Periodic trends arise from repeating valence-shell patterns.
The periodic table organizes these regularities.

Chadwick identified the neutral nuclear particle in 1932.
Neutrons explain isotopic mass differences.

Quantum mechanics describes electron probability distributions.
An orbital can hold up to two electrons with opposite spins.

The Pauli exclusion principle allows two electrons per orbital.
They must have opposite spin quantum numbers.

An s subshell contains one orbital.
It can hold a maximum of two electrons.

A p subshell contains three orbitals.
It can hold a maximum of six electrons.

Triglycerides are major energy-storage lipids.
They form through ester bonds.