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Atomic Structure Questions

Practice 77 Atomic Structure questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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77
Total Questions
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26
Easy
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48
Medium
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3
Hard
Practice by Exam:Chemistry(65)Mathematics and Science(3)Physics(2)Science(2)CHEMISTRY(2)General Awareness(1)General Science(1)General Knowledge(1)

About Atomic Structure — practice questions, PYQs & concepts

Atomic Structure is a frequently-tested topic on Chemistry, Mathematics and Science, Physics. ExamTest.live currently lists 77 Atomic Structure questions spanning previous-year papers from 2017 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Atomic Structure weight in competitive exams

Across our Atomic Structure question bank, the largest sources are Chemistry (65), Mathematics and Science (3), Physics (2), Science (2) and CHEMISTRY (2). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 26 easy Atomic Structure questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
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  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Atomic Structure Questions(1–77 of 77)

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Q1mediummcqScienceSSC CGL2026
67% accuracy
Fe has 26 protons in its nucleus. What are the number of electrons in Fe
2+
(II) ion?
Q2easymcqChemistryAIEEE2026
0% accuracy
Which of the following statements in relation to the hydrogen atom is correct?
Q3mediummcqChemistryAIEEE2026
0% accuracy
Of the following sets which one does NOT contain isoelectronic species?
Q4mediummcqChemistryAIEEE2026
0% accuracy
In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?(a) (b) (c) (d) (e)
Q5mediummcqChemistryCompetitive Exam2026
0% accuracy
is isoelectronic with
Q6mediummcqChemistryAIEEE 20072026
0% accuracy
Which of the following sets of quantum numbers represents the highest energy of an atom?
Q7mediummcqChemistryAIEEE 20062026
0% accuracy
Uncertainty in the position of an electron () moving with a velocity , accurate up to , will be ():
Q8easymcqChemistryAIEEE 20062026
0% accuracy
According to Bohr’s theory, the angular momentum of an electron in orbit is:
Q9mediummcqChemistryNEET (UG) 20172026
0% accuracy
Which one is the wrong statement?
Q10easymcqChemistryNEET 20192026
0% accuracy
and orbitals are arranged in the order of decreasing energy. The correct option is:
Q11easymcqChemistryNEET 20192026
0% accuracy
Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?
Q12mediummcqGeneral AwarenessSSC CGL2026
0% accuracy
What is the mass number of Deuterium?
Q13mediummcqPhysicsGeneral Knowledge2026
0% accuracy
Mass of atom is determined by
Q14easymcqChemistryNEET (UG) 20242026
Match List I with List II regarding quantum numbers:
image
Q15mediummcqChemistryNEET (UG) 20242026
The energy of an electron in the ground state () for ion is . Then, the energy for an electron in state for ion in is:
Q16easymcqChemistryAIEEE 20042026
Which of the following sets of quantum numbers is correct for an electron in a orbital?
Q17easymcqChemistryAIEEE 20042026
Consider the ground state of a atom (). The number of electrons with azimuthal quantum numbers and are respectively:
Q18mediummcqChemistryAIEEE 20042026
The wavelength of the radiation emitted, when in a hydrogen atom an electron falls from infinity to stationary state , would be (Rydberg constant ):
Q19mediummcqChemistryNEET 20232026
The relation between ( the number of permissible values of magnetic quantum number ()) for a given value of azimuthal quantum number (), is:
Q20mediummcqChemistryNEET 20222026
Identify the incorrect statement from the following:
Q21easymcqChemistryNEET 20232026
Select the correct statements from the following:A. Atoms of all elements are composed of two fundamental particles.B. The mass of the electron is .C. All the isotopes of a given element show same chemical properties.D. Protons and electrons are, collectively known as nucleons.E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.Choose the correct answer from the options given below:
Q22mediummcqChemistryAIEEE2026
Which one of the following constitutes a group of isoelectronic species?
Q23mediummcqSciencePrepp2026
How many electrons does a hydrogen molecule have in its K shell?
Q24mediummcqChemistryIndian Competitive Exams2026
The present atomic weight scale is based on
Q25mediummcqChemistryCompetitive Exam2026
The present atomic weight scale is based on:
Q26mediummcqChemistryCompetitive Exam Mock2026
is isoelectronic with
Q27mediummcqGeneral ScienceSSC CGL2026
Which of the following is false?
Q28mediummcqChemistrySSC CGL2026
What charge is present on a neutron?
Q29easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
Magnetic Quantum number determines
Q30mediummcqChemistryCompetitive Exam2026
Which of the following is NOT an isotope of hydrogen?
Q31mediummcqGeneral KnowledgePrepp2026
The signs of charges of electron, proton and neutron are __________, respectively.
Q32mediummcqChemistryAIEEE2026
The ionization enthalpy of hydrogen atom is . The energy required to excite the electron in the atom from to is:
Q33mediummcqChemistryJEE Main2026
Energy of an electron is given by . Wavelength of light required to excite an electron in a hydrogen atom from level to will be ( and ):
Q34mediummcqChemistryAIEEE 20122026
The electrons identified by quantum numbers and :(a) (b) (c) (d) Can be placed in order of increasing energy as:
Q35mediummcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
A gas absorbs a photon of and emits at two wavelengths. If one of the emissions is at , the other is at:
Q36mediummcqChemistryAIEEE2026
Ionisation energy of is . The energy of the first stationary state () of is:
Q37mediummcqChemistryAIEEE2026
The energy required to break one mole of bonds in is . The longest wavelength of light capable of breaking a single bond is ( and ):
Q38mediummcqChemistryAIEEE 20092026
Calculate the wavelength (in nanometer) associated with a proton moving at . (Mass of proton and ):
Q39mediummcqChemistryAIEEE 20092026
In an atom, an electron is moving with a speed of with an accuracy of . Certainty with which the position of the electron can be located is (, mass of electron ):
Q40mediummcqChemistryNEET 20222026
If radius of second Bohr orbit of the ion is , What is the radius of third Bohr Orbit of ion?
Q41easymcqChemistryNEET 20212026
From the following pairs of ions which one is not an iso-electronic pair?
Q42easymcqChemistryNEET 20212026
A particular station of All India Radio, New Delhi, broadcasts on a frequency of (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is: [Speed of light, ]
Q43hardmcqCHEMISTRYNEET 20192026
Orbital having 3 angular nodes and 3 total nodes is:
Q44mediummcqCHEMISTRYNEET 20192026
In a hydrogen atom, what is the de-Broglie wavelength of an electron in the second Bohr orbit? [Given that Bohr radius ]
Q45easymcqChemistryNEET (UG) 20182026
Which one is a wrong statement?
Q46easymcqChemistryNEET 20172026
Which one is the wrong statement?
Q47easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2017
Rutherford's alpha () particle scattering experiment resulted into the discovery of
Q48easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2017
Rutherford's alpha (α) particle scattering experiment led to the discovery of the
Q49hardmcqPhysicsPhysics
2% accuracy
Energy and radius of first Bohr orbit of and are:[Given ]
Q50mediummcqChemistryChemistry
2% accuracy
Dalton's Atomic theory could not explain which of the following?
Q51mediummcqChemistryChemistry
0% accuracy
If , the correct sequence of filling of electrons will be:
Q52mediummcqChemistryChemistry
0% accuracy
The energies and of two radiations are and respectively. The relation between their wavelengths i.e. and will be:
Q53mediummcqChemistryChemistry
0% accuracy
The total number of atomic orbitals in fourth energy level of an atom is:
Q54mediummcqChemistryChemistry
100% accuracy
Consider the following sets of quantum numbers
image
Which of the following sets of quantum number is not possible?
Q55easymcqChemistryChemistry
Which of the following is not a permissible arrangement of electrons in an atom?
Q56easymcqChemistryChemistry
Which of the following pairs of -orbitals will have electron density along the axis?
Q57mediummcqChemistryChemistry
The most probable radius (in ) for finding the electron in is:
Q58mediummcqChemistryChemistry
Assertion : First ionization energy for nitrogen is lower than oxygen.Reason : Across a period effective nuclear charge decreases.
Q59mediummcqChemistryChemistry
Given : The mass of electron is plank constant is , the uncertainty involved in the measurement of velocity within a distance of is :
Q60easymcqChemistryChemistry
The orientation of an atomic orbital is governed by :
Q61mediummcqChemistryChemistry
If the uncertainty in position and momentum of a particle are equal, then the uncertainty in its velocity is:
Q62mediummcqChemistryChemistry
If uncertainty in position and momentum are equal, then uncertainty in velocity is:
Q63easymcqChemistryChemistry
The measurement of the electron position is associated with an uncertainty in momentum, which is equal to . The uncertainty in electron velocity is (mass of an electron is ):
Q64easymcqChemistryChemistry
How many electrons can fit in the orbital for which and ?
Q65mediummcqChemistryChemistry
Two electrons occupying the same orbital are distinguished by:
Q66hardmcqChemistryChemistry
The energy absorbed by each molecule () of a substance is and bond energy per molecule is . The kinetic energy of the molecule per atom will be:
Q67easymcqChemistryChemistry
Maximum number of electrons in a subshell of an atom is determined by the following:
Q68easymcqChemistryChemistry
Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. No. )
Q69mediummcqChemistryChemistry
According to the Bohr Theory, which transition in the hydrogen atom will give rise to the least energetic photon?
Q70easymcqChemistryChemistry
The orbital angular momentum of a -electron is given as:
Q71mediummcqChemistryChemistry
Maximum number of electrons in a subshell with and is:
Q72mediummcqChemistryChemistry
The correct set of four quantum numbers for the valence electron of rubidium atom () is:
Q73mediummcqChemistryChemistry
What is the maximum number of electrons that can be associated with the following set of quantum numbers: ?
Q74mediummcqChemistryChemistry
Based on the equation , which of the following conclusions is not correct?
Q75easymcqChemistryChemistry
What is the maximum number of orbitals that can be identified with the following quantum numbers ?
Q76easymcqChemistryChemistry
Calculate the energy in joule corresponding to light of wavelength : (Planck constant , speed of light )
Q77easymcqChemistryChemistry
is isoelectronic with which of the following ions?

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