Common NEET MCQ’s on the Structure of Atom

structure of atom

Structure of Atom – Practice Multiple Choice Questions (MCQ’s) for NEET

The chapter on the structure of atoms covers the existence of different kinds of matter around us due to the presence of atoms and molecules in them. This forms the fundamentals of science, teaching the basics of particles. It covers the discovery and characteristics of protons, electrons and neutrons. 

These MCQs on Structure of Atom for NEET will help you ace your exam.

MCQ on Chemistry Chapter – Atomic Structure

Atoms and molecules are the building blocks of matter. Different kinds of matter around us are due to the different atoms and molecules present in them. For a long time, it was assumed that atoms are indivisible and lack an inner structure. But we now know that atoms are divisible and have an inner structure. They have smaller particles in them which are called subatomic particles.

Here is the questionnaire: 

1) Which of the following represents the correct electron distribution in magnesium ions?

a) 2,8

b) 2,8,1

c) 2,8,2

d) 2,8,3

2) Rutherford’s alpha-particle scattering experiment led to the discovery of?

a) Nucleus

b) Electrons

c) Protons

d) Neutrons

3) Which of the following is the correct electronic configuration of sodium?

a) 2,8,1

b) 8,2,1

c) 2,1,8

d) 2,8,2

4) The particle is not present in an ordinary hydrogen atom is:

a) proton

b) neutron

c) nucleus

d) electron

5. The subatomic particle called electron was discovered by:

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a) JJ Thompson

b) Neils Bohr

c) James Chadwick

d) E. Goldstein

6. The correct electronic configuration of the chloride ion is:

a) 2,8

b) 2,8,4

c) 2,8,8

d) 2,8,7

7. Goldstein’s experiments which involved passing high voltage electricity through gases at very low pressure, resulted in the evolution of :

a) electron

b) proton

c) nucleus

d) neutron

8.  The ion of an element has 3 positive changes. The mass number of atoms of this element is 27, and the number of neutrons is 14. What is the number of electrons in the ion?

a) 19

b) 10

c) 14

d) 16

9. The first model of the atom was formulated by:

a) Neils Bohr

b) Ernest Rutherford

c) J.J. Thompson

d) Eugen Goldstein

10.  Which of the following statements is always correct?

a) an atom has an equal number of electrons and protons

b) an atom has an equal number of electrons and neutrons

c) an atom has an equal number of protons and neutrons

d) an atom has an equal number of electrons, protons and neutrons

11. What is the formula for a mass number of an atom?

a) Number of protons plus the number of electrons

b) Number of electrons plus the number of neutrons

c) Number of neutrons plus the number of protons

d) None of the above.

12. Atoms that have a different atomic number but the same mass number are called?

a) Isomers

b) Isobars

c) Isotones

d) Isotopes

13. What happens to the atomic number during a chemical reaction?

(a) It changes

(b) It increases

(c) Changes alternatively

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(d) Remains the same

14. An atom has 4 unpaired electrons. What is likely to be the total spin of the electron?

(a) 1

(b) 2.5

(c) 2

(d) 4

15. An atom of element E contains 3 protons, 3 electrons and 4 neutrons. What is its mass number?

(a) 7

(b) 6

(c) 9

(d) 10

16. The electronic configuration of an element Y is 2, 8, 8. What is the atomic number of the element?

(a) 11

(b) 16

(c) 17

(d) 18

17. An atom of an element X has 7 electrons in its M shell. What could element X be?

(a) Cation (positive ion)

(b) Anion (negative ion)

(c) Both

(d) None of the above


1. (a) 2.8  2. (a) Nucleus 3. (a) 2,8,1 4. (b) Neutron 5. (a) James Chadwick 6. (c) 2,8,8  7. (b) Proton 8. (b) 10 9. (c) J.J. Thompson 10. (a) an atom has an equal number of electrons and protons 11. (c) Number of neutrons plus number of protons 12. (d) Isotopes 13. (d) Remains the same 14. (c) 2 15. (a) 7 16. (d) 17. (b) Anion (negative ion)

Facts about Structure of Atoms

  • Atoms are made up of three subatomic particles: electrons, protons and neutrons.
  • Electrons are outside the nucleus.
  • The atoms of different elements differ in the number of protons, electrons and neutrons. 
  • Protons and neutrons are present in a small nucleus at the centre of the atom.
  • The existence of electrons in an atom was shown by J.J. Thompson in 1897.
  • The most important features of an electron are its mass and charge. 
  • E. Goldstein showed the existence of protons in the atoms. 
  • James Chadwick showed the discovery of another subatomic particle called a neuron. 
  • The nucleus is a small, positively charged part at the centre of an atom. 
  • Protons and neutrons taken together are called nucleons. 
  • Neils Bohr’s concept of an atom defined it as being made of three particles – electrons, protons and neutrons. 
  • The atomic number of an element is equal to the number of protons in one atom of an element. 
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MCQs on Structure of Atom for NEET

Now you’re aware of a massive part of NEET chemistry, and those questions will assist you in getting an average concept of ways the multiple-desire questions are framed. 

An important factor in such questions is that you may frequently locate the alternatives to be comparable and how the questions are generally framed. The solutions are very close to each other, and therefore it is important to understand the concepts well before taking up these tests. Even the slightest false impression can lead you to mark the solution wrong. Therefore, make certain you undergo the shape of atom elegance eleven notes for NEET meticulously. 

The atomic shape is the essential chapter of understanding Chemistry. It is consequently important so as to broaden a stronghold in this chapter, so you ace the problem as a whole. The MCQ on atomic shape is supposed to evaluate your expertise and hold close over the minute info covered within the chapter. 

Therefore, make certain you revise the chapter and atomic shape questions very well before attempting any exam. It will assist you in deciding your stage of examination preparation. Also, listing down the errors and rectifying them from before can help avoid mistakes during the final examination.