MDCAT Atomic Structure MCQs
Customize your practice drill: select target topics, configure your question limit (up to 180 MCQs per test), and choose your mode.
Total Topics
6
Selected Topics
6
Available MCQs
919
Question Limit
Up to 180
Select Topics to Practice
Questions will be drawn only from checked topics.
Test Configuration
Configure question count (limit 180) and testing mode.
Selected topics have 919 total questions. Test will draw 50 shuffled MCQs.
Sample Atomic Structure MCQs with answers
Try these questions, then open the answer to check your reasoning. Use the quiz above for more topics and a complete review.
Proton Discovery
1. The e/m values for the positive rays depends on ________enclosed in a discharge tube.
- A. Nature of gas
- B. Properties of gas
- C. Composition of gas
- D. All of these
View answer and explanation
Answer: A. Nature of gas
In a discharge tube the positive (canal) rays consist of the residual gas ions, so their charge-to-mass ratio depends on which gas is present. The nature of the gas determines the mass of the positive ions formed, and hence the e/m value. This is why canal-ray e/m varies with the gas, unlike cathode rays whose e/m is constant.
Electronic Configuration
2. How many unpaired electrons are present in a ground-state nitrogen atom?
- A. 1
- B. 0
- C. 2
- D. 3
View answer and explanation
Answer: D. 3
Nitrogen has 2p³; Hund's rule places one electron in each p orbital, giving three unpaired electrons.
Electronic Configuration
3. Isotopes are the sister atoms of the same element with similar chemical properties and different which among the following:
- A. Atomic Number
- B. Atomic Volume
- C. Atomic Structure
- D. Atomic Mass
View answer and explanation
Answer: D. Atomic Mass
Isotopes of an element have the same atomic number (protons) and chemistry but different numbers of neutrons, hence different atomic masses. Hence 'atomic mass' is correct.
About this unit
MDCAT Atomic Structure — Unit 18
919 practice MCQs covering Proton Discovery, Quantum Theory, Quantum Numbers, Orbital Shapes, Hydrogen Spectrum, Electronic Configuration. Select custom topics and sit tailored tests up to 180 questions per drill.
Common questions about Atomic Structure practice
How many Atomic Structure MCQs are available on DIFF. MDCAT?
The current Atomic Structure question bank contains 919 practice MCQs across 6 topics. This is the bank size, not the length of one test. Choose your topics and a question count from 1 to 180, limited by the questions available in those topics.
Which topics does the Atomic Structure quiz cover?
The selectable topics are Proton Discovery, Quantum Theory, Quantum Numbers, Orbital Shapes, Hydrogen Spectrum, Electronic Configuration. Use Select all for a broad chapter drill, Clear to start a focused selection, or choose individual topics. Questions are drawn from your chosen topics, so you can target a weak concept before returning to a wider test.
How do I build a custom Atomic Structure test?
Open the chapter builder, select one or more topics, enter your question count, and choose Tutor Mode or Timed Exam. The available-question total updates with your selection. Start Test generates a shuffled drill; you do not have to follow a fixed Quiz 1 or Quiz 2 sequence.
What is the difference between Tutor Mode and Timed Exam?
Tutor Mode gives feedback and an explanation after you choose an option, and you can change or clear that choice. Timed Exam runs a countdown and keeps explanations hidden until submission. Both modes let you move between questions, use the paper map, and submit for a complete review.
How do I review and download my Atomic Structure quiz?
Select Submit Quiz, then Submit & View Explanations. The review includes every question in your test, all options, your selection, the marked correct answer when a key is available, and the explanation. Download PDF saves a paginated review; Download Review saves an HTML copy you can open in a browser. The review also includes DIFF. MDCAT community links.
How should I use Atomic Structure MCQs to improve?
Start with a short tutor drill on one of these topics: Proton Discovery, Quantum Theory, Quantum Numbers. Read the explanation for incorrect and uncertain answers, revise the relevant textbook section, and retry before taking a timed drill. Compare your reasoning with the answer key rather than memorising the option letter.