In an atom, the nucleus when compared to the extra-nuclear part, is _?

A. Smaller in volume but heavier in mass

B. Larger in volume but lighter in mass

C. Smaller in both volume and mass

D. Larger in both volume and mass

Everyday Science · Atoms, Elements & Compounds · page 1 of 30

Atoms MCQs with Answers

Includes 16 past paper MCQs (marked).

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Atoms MCQs (1–10)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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1.
Past Paper MCQ
Who discovered the neutron?
Correct Answer: B. James Chadwick
One-liner
The neutron was discovered by James Chadwick in 1932.
2.
Past Paper MCQ
The uncharged particle of an atom is ?
Correct Answer: C. Neutron
One-liner
The uncharged particle of an atom is the neutron.
3.
How many electrons are in Cl-37 with charge -1?
Correct Answer: B. 18
One-liner
A Cl-37 ion with a -1 charge has 18 electrons.
4.
Oxygen has 6 electrons in its valence shell so its valency is ?
Correct Answer: C. 2
One-liner
Oxygen has 6 valence electrons and needs 2 more to complete its octet, so its valency is 2.
5.
A non-metal atom forms an anion by ?
Correct Answer: A. Gain of electrons
One-liner
A non-metal atom forms an anion by the gain of electrons.
6.
Name the material of screen which is used in Rutherford's atomic model?
Correct Answer: D. Zinc sulphide
One-liner
The screen used in Rutherford's atomic model experiment was coated with zinc sulphide.
7.
The maximum number of electrons with n=3 and l=2 is _?
Correct Answer: D. 10
One-liner
The maximum number of electrons with n=3 and l=2 is 10, as the d-subshell (l=2) has 5 orbitals, each holding 2 electrons.
8.
The electrons involved in the formation of a chemical bond are found in the _?
Correct Answer: C. Valence shell
One-liner
The electrons involved in bond formation are found in the valence shell (the outermost shell of an atom).
9.
In an atom, the nucleus when compared to the extra-nuclear part, is _?
Correct Answer: A. Smaller in volume but heavier in mass
One-liner
The nucleus is smaller in volume but heavier in mass compared to the extra-nuclear part of an atom.
10.
An atom has the same number of _?
Correct Answer: D. Electrons and Protons
One-liner
An atom has the same number of electrons and protons in its neutral state.

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Atoms MCQs with Answers

Atoms MCQs (1–10)

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