Structure of Atom MCQs for NEET

The first chapter in Chemistry is the atomic structure, and it builds the foundation of understanding the subject. You should be well versed in the fundamentals of elements and molecules. In this regard, the atomic structure questions will further help in developing a strong understanding of the chapter. 

Herein, you will find MCQ on the atomic structure chapter so that you can test your knowledge. Besides, you will be prepared to face the exam papers if you are aware of similar questions beforehand. This will boost your confidence in cracking the exam with better grades as well.

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About Structure of Atom:

The 5 Parts of an Atom

• Nucleus

• Electron shell

Nucleus Features following :

• Protons

• Neutrons

• Electrons

Goldstein in 1886 proposed that the charge to mass rate of the positive patches depends on the nature of the gas which is present in the discharge tube. This means that the charge to mass rate (e/ m) was different for different feasts. 

He observed that the charge to mass rate of the positive shafts was loftiest in the case of the hydrogen gas that was used in the discharge tube. This is substantial because hydrogen is the lightest atom so m will be the least hence e/ m rate will be loftiest in this case. The flyspeck in the positive shafts in the discharge tube was named a proton. 

What is a Hydrogen Ion?

The hydrogen nucleus is made up of a flyspeck carrying a unit positive electric charge, called a proton. The insulated hydrogen ion, represented by the symbol H+, is thus customarily used to represent a proton. Because the bare nucleus can readily combine with other patches (electrons, tittles, and motes), the insulated hydrogen ion can live only in a nearly flyspeck-free space ( high vacuum) and in the gassy state. 

MCQ on Chemistry - Atomic Structure

Every molecule consists of atoms, and everything we see around us is made up of molecules. Atoms further consist of smaller charged particles that are either positively or negatively charged.

The positively charged particles are called protons, and the negative ones are called electrons. An atom also has a neutral particle that is called a neutron. Chemical bonding of various atoms takes place due to the sharing of electrons. Herein, NEET chemistry MCQ on the structure of atom deals with various questions that cover the fundamentals as well as the advanced concepts.

1. Who discovered electrons?

1. Rutherford.

2. J. J. Thomson.

3. Neils Bohr.

4. James Chadwick.

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

1. Number of protons + number of electrons.

2. Number of neutrons + number of electrons.

3. Number of protons + number of neutrons.

4. None of these.

3. An atom has mass number 37 and atomic number 17. Find the number of protons.

1. 21

2. 22

3. 17

4. 20

4. Which of the following is responsible for the mass of an atom?

1. Only protons.

2. Only neutrons.

3. Neutrons and protons.

4. Protons and electrons.

5. Which of the following determines the atomic number of an atom?

1. Number of electrons.

2. Number of protons.

3. Number of electrons and protons.

4. Number of protons and neutrons.

6. Nickel has atomic number 28. Choose the correct electronic configuration for Nickel.

1. 1s² 2s² 2p⁴ 3s² 3p⁸ 3d¹⁰

2. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s²

3. 1s² 2s² 2p⁴ 3s² 3p⁶ 4s²

4. 1s² 2s² 3s² 3p⁸ 3d¹⁰

7. If both the K and L shells are full, what would be the atomic number of that element?

1. 20

2. 14

3. 10

4. 16

8. Which of the following determines the chemical properties?

1. Number of protons.

2. Number of electrons.

3. Number of neutrons.

4. None of these.

9. Atoms that have the same mass number and different atomic number are called?

1. Isotopes.

2. Isotones.

3. Isobars.

4. Isomers. 

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

1. It increases.

2. It changes.

3. Remains the same.

4. Changes alternatively.

11. Who proposed the atomic theory?

1. John Dalton.

2. Robert Millikan.

3. J. J. Thomson.

4. Neils Bohr.

12. The electronic configuration of atomic number 20 of an atom is which of the following?

1. 2, 6, 6, 2

2. 2, 8, 8, 2

3. 2, 4, 6, 2

4. 2, 4, 6, 2

13. Does an atom differ from an ion with respect to which of the following?

1. Number of protons.

2. Nuclear charge.

3. Number of electrons.

4. Mass number.

14. The maximum mass of an atom is concentrated in which of these?

1. Nucleus.

2. Neutrons.

3. Protons.

4. Electrons. 

15. The isotopes of a neutral atom of an element differ in which of these?

1. Physical properties.

2. Chemical properties.

3. Atomic number.

4. Mass number.

16. What is the sequence to label the subshells in an atom?

1. S, p, d, f, g

2. S, p, p, f, d

3. S, s, p, p, d, f, g

4. S, p, g, d, f

17. The electronic configuration for oxygen is written as 1s2 2s2 2p4. Which rule will this configuration be violating?

1. Aufbau’s principle.

2. Hund’s rule.

3. Pauli’s exclusion principle.

4. None of the above.

18. If an atom has four unpaired electrons. What is likely to be the total spin of the electron?

1. 1

2. 2.5

3. 2

4. 4

Answers: 1(b), 2(c), 3(c), 4(c), 5(b), 6(b), 7(c), 8(b), 9(a), 10(c), 11(b), 12(b), 13(c), 14(a), 15(c), 16(a), 17(d), 18(c)

Now you are aware of a considerable portion of NEET chemistry, these questions will help you in getting an overall idea of how the multiple-choice questions are framed. A crucial aspect of such questions is that you will often find the options to be similar or close to each other in terms of meaning.

Even the slightest misunderstanding can lead you to mark the answer wrong. Therefore, make sure you go through the structure of atom class 11 notes for NEET meticulously. You can not only develop an understanding but also avoid making silly mistakes in the exam.

Atomic structure is the fundamental chapter of studying Chemistry. It is thus vital for you to develop a stronghold on this chapter so that you ace the subject as a whole. The MCQ on the atomic structure is meant to assess your understanding and grasp over the minute details included in the chapter.

Therefore, make sure you revise the chapter and atomic structure questions thoroughly before solving these. It will help you to judge your level of exam preparation. Also, list down the mistakes and learn from them to not repeat them in your actual exam.