COMSATS Chemistry — Atomic Structure
Atomic Structure is part of the Chemistry section of the NTS NAT-IE test COMSATS admits on (10 of the 90 MCQs). It breaks into 2 subtopics, and we hold 28 NAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Atomic Structure is tested
Across the 7 NAT-pattern papers on ParhaiKrlo, Atomic Structure accounts for 7 questions. It appears in all 7, about 1 questions a paper. The heaviest was COMSATS Past Paper 07, with 1 question.
| Paper | Questions |
|---|---|
| COMSATS Past Paper 07 | 1 |
| COMSATS Past Paper 06 | 1 |
| COMSATS Past Paper 05 | 1 |
| COMSATS Past Paper 04 | 1 |
| COMSATS Past Paper 03 | 1 |
| COMSATS Past Paper 02 | 1 |
| COMSATS Past Paper 01 | 1 |
Atomic Structure MCQs from the NAT-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · COMSATS Past Paper 07 · Atomic Structure
The maximum number of electrons that a single orbital can hold is:
- A.8
- B.2
- C.1
- D.6
Show answer
Answer: B. 2 — Pauli's principle allows two electrons per orbital, with opposite spins.
- Q2 · COMSATS Past Paper 06 · Atomic Structure
Isotopes of an element have the same number of:
- A.protons
- B.neutrons
- C.mass number
- D.nucleons
Show answer
Answer: A. protons — Isotopes share the atomic number (protons) but differ in neutrons.
- Q3 · COMSATS Past Paper 05 · Atomic Structure
The electronic configuration of sodium (Z = 11) is:
- A.1s² 2s² 2p⁶ 3s¹
- B.1s² 2s² 2p⁷ 3s⁰
- C.1s² 2s² 2p⁶ 3p¹
- D.1s² 2s² 2p⁵ 3s²
Show answer
Answer: A. 1s² 2s² 2p⁶ 3s¹ — 11 electrons: 2 + 2 + 6 + 1.