The volume of an atom is calculated by using _?

A. Atomic radius and formula for volume of a sphere

B. Atomic mass and density formula

C. Atomic number and Avogadro's number

D. Nuclear radius and formula for volume of a cylinder

As the number of protons increases, the ionization energy?

A. First decreases then increases

Everyday Science · Atoms, Elements & Compounds · page 25 of 30

Atoms MCQs with Answers

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Atoms MCQs (241–250)

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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241.
Mass number A refers to _
Correct Answer: B. Number of nucleons
One-liner
Mass number (A) refers to the total number of nucleons (protons + neutrons) in the nucleus of an atom.
242.
The amount of energy required to break a nucleus is called its?
Correct Answer: C. Binding energy
One-liner
The amount of energy required to break a nucleus into its constituent protons and neutrons is called binding energy.
243.
Past Paper MCQ
The volume of an atom is calculated by using _?
Correct Answer: A. Atomic radius and formula for volume of a sphere
One-liner
The volume of an atom is calculated using its atomic radius and the formula for the volume of a sphere (V = 4/3 πr³).
244.
Which one of the following decreases along the period?
Correct Answer: A. Atomic Radius
One-liner
Atomic Radius decreases along a period from left to right due to increasing nuclear charge pulling electrons closer to the nucleus.
245.
The maximum probability of finding an electron is at a distance of _?
Correct Answer: A. 0.053 nm
One-liner
The maximum probability of finding an electron in a hydrogen atom is at a distance of 0.053 nm from the nucleus, known as the Bohr radius.
246.
As the number of protons increases, the ionization energy?
Correct Answer: D. Increases
One-liner
As the number of protons increases, the ionization energy increases because greater nuclear charge holds electrons more tightly.
247.
Which of the following has the least ionization energy?
Correct Answer: C. Argon (Ar)
One-liner
Argon (Ar) has the least ionization energy among the given noble gases because ionization energy decreases down the group as atomic size increases.
248.
Nuclei having the same nuclear charge but different masses are called ?
Correct Answer: D. Isotopes
One-liner
Nuclei having the same nuclear charge (atomic number) but different masses are called Isotopes.
249.
When an electron jumps from a higher energy level to a lower energy level, it energy.
Correct Answer: D. Radiates
One-liner
When an electron jumps from a higher energy level to a lower energy level, it radiates energy in the form of a photon.
250.
The specific number of protons present in the nucleus of every atom is called its?
Correct Answer: C. Atomic Number
One-liner
The specific number of protons present in the nucleus of an atom is called its Atomic Number.

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Atoms MCQs with Answers

Atoms MCQs (241–250)

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