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Atomic Structure – GK Quiz with Answers – Level 3

Harder GK questions on atomic structure: Dalton to Bohr, canal rays, isotopes and isobars, shell capacity, atomic mass unit, Avogadro number and the medical and industrial uses of isotopes.

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Questions, answer key and solutions.

Questions
50
Duration
35 min
Marks
50

Negative marking

Attempts
100
Access
Free
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Normal practice, or a Simulated test

Both use the same questions. Normal practice is untimed and needs no account: choose an option and the answer and solution appear at once. The Simulated test is the real computer-based format, with one 35-minute clock, a question palette and full screen, and your score, the key and the solutions arrive when you submit.

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How the two modes differ
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Normal

Untimed

Every question on one page, loading as you scroll. Choose an option and see straight away whether it was right.

  • No timer. Nothing to start and nothing to submit. Stop whenever you like.
  • Answered as you choose. Tap an option and it is marked at once, with the correct answer shown.
  • Solutions in place. The explanation, and the video where one has been added, sit under the question.
  • Open to guests. Normal practice needs no sign-in.
Real exam conditions

Simulated

Timed CBT

The computer-based test format: one clock, a question palette, and a score the moment you submit.

  • A clock that does not pause. 35 minutes from the moment you begin, and the paper is submitted for you when it reaches zero.
  • Question palette. Answered, not answered and marked for review, section by section, as the real interface has it.
  • Full screen, proctored. The test takes over the screen; leaving it three times submits the paper.
  • Answers hidden until you submit. The key, the explanations and your score all arrive together at the end.

About this test

Atomic Structure GK Quiz Level 3: Isotopes, Shells and Atomic Models

This is the Level 3 Atomic Structure GK quiz, a harder set on how ideas about the atom developed and how sub-atomic particles decide an element's identity. It moves from Kanad's Parmanu and Dalton's theory to the Bohr model, isotopes, isobars and the mole. Aptitude360 explains the answer to every question.

Topics covered in this Level 3 atomic structure set

  • Early ideas: Maharishi Kanad's Parmanu, Dalton's atomic theory, and the laws of conservation of mass and definite proportions
  • Atomic models of Thomson, Rutherford and Bohr, and the order in which they came
  • Sub-atomic particles, Goldstein's canal rays and the relative masses of the electron and proton
  • Atomic number, mass number and nucleons worked out from protons and neutrons
  • Isotopes and isobars, with chlorine, calcium and argon examples
  • Maximum electron capacity of the K, L, M and N shells
  • Atomic mass unit, the carbon standard for it, and Avogadro number
  • Uses of isotopes of iodine, cobalt and uranium

Key concepts to revise for atomic structure GK

  • An element is identified by its atomic number, not its mass number
  • Isotopes share atomic number; isobars share mass number but differ in atomic number
  • Electrons add almost nothing to mass, so mass number counts only protons and neutrons
  • Bohr placed electrons in shells of fixed energy, while Rutherford's alpha-particle scattering experiment revealed the nucleus

Revision tips for statement and matching questions

  • Build a timeline from Kanad to Bohr so chronology questions become quick to settle
  • Pair each scientist with one discovery or law, such as Proust with definite proportions and Goldstein with canal rays
  • Practise finding mass number and shell filling by hand until the steps feel automatic

Who should take this atomic structure quiz

It suits General Awareness aspirants who have finished the basics of atomic structure and want tougher, statement-based chemistry practice.

FAQs about Atomic Structure – GK Quiz with Answers – Level 3

What is the difference between isotopes and isobars?
Isotopes are atoms of the same element with the same atomic number but different mass numbers, such as the two common isotopes of chlorine. Isobars are atoms of different elements with the same mass number, such as calcium and argon atoms of mass number forty.
How many electrons can a shell hold in atomic structure?
A shell can hold at most two times the square of its shell number. So the K shell holds two, the L shell eight, the M shell eighteen and the N shell thirty-two electrons.
What is the difference between atomic number and mass number?
Atomic number is the number of protons in the nucleus. Mass number is the total number of protons and neutrons, also called nucleons.
Who discovered the proton, electron and neutron?
J. J. Thomson discovered the electron and James Chadwick discovered the neutron. Rutherford is credited with identifying the proton, while E. Goldstein separately discovered canal rays, which are streams of positive ions.

Test structure

How the paper is split, and how long each part runs. A section you have finished cannot be returned to.

SectionQuestionsTime
Atomic Structure GK Level 35035 min

Marking & rules

Total marks
50 across 50 questions.
Negative marking
A wrong answer costs marks. Leaving a question unanswered costs nothing.
Attempts
100 in total. An attempt is spent the moment you begin one.

What you get when you submit

The analysis is ready the moment you submit the paper.

Score and accuracy

Marks, percentage, right, wrong and skipped, and the time you took.

Section by section

The same figures for each section, so a weak one cannot hide in an average.

The full answer key

Every question with your answer, the right one, the working, and the video where there is one.

Where you stand

Your score against the spread of everyone else who has sat this test.

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