Everyday Science · Atoms, Elements & Compounds · page 23 of 30

Atoms MCQs with Answers

Includes 16 past paper MCQs (marked).

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Atoms MCQs (221–230)

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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221.
Past Paper MCQ
What do isotopes of an element have in common?
Correct Answer: A. Number of protons
One-liner
Isotopes of an element have the same number of protons but differ in the number of neutrons.
222.
Which of the following quantum numbers describes the shape of an electron in an atom?
Correct Answer: B. Azimuthal quantum number
One-liner
The Azimuthal quantum number (also called the angular momentum quantum number) describes the shape of an electron orbital in an atom.
223.
Which one of the following is most penetrating?
Correct Answer: C. Neutron
One-liner
Among the given options, neutron is the most penetrating because it carries no electric charge and is not repelled by atomic nuclei or electrons.
224.
Which atom has at least single electron in dumbbell shape orbital?
Correct Answer: B. Carbon
One-liner
Carbon has at least one electron in a dumbbell-shaped (p) orbital because its electronic configuration includes electrons in the 2p subshell.
225.
Tendency of atoms to acquire eight electrons in their valence shell is ?
Correct Answer: A. Octet rule
One-liner
The tendency of atoms to acquire eight electrons in their valence shell is called the Octet rule.
226.
Isobars have the same ?
Correct Answer: B. Mass number
One-liner
Isobars are atoms of different elements that have the same mass number but different atomic numbers.
227.
The atomic property defined as the minimum energy required to remove an electron from a gaseous atom in its ground state is called _?
Correct Answer: B. Ionization Energy
One-liner
The minimum energy required to remove an electron from a gaseous atom in its ground state is called Ionization Energy.
228.
What is the maximum number of electrons that can be accommodated in a 6d orbital?
Correct Answer: C. 10
One-liner
A d-orbital can hold a maximum of 10 electrons, regardless of the principal quantum number (n).
229.
The atomic mass of an element expressed in gram is ?
Correct Answer: A. Gram atomic mass
One-liner
The atomic mass of an element expressed in grams is called gram atomic mass.
230.
The Magnetic quantum number for 4f orbital would be _?
Correct Answer: C. -3, -2, -1, 0, +1, +2, +3
One-liner
The magnetic quantum number for a 4f orbital is -3, -2, -1, 0, +1, +2, +3 (seven values, corresponding to l = 3).

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Atoms MCQs with Answers

Atoms MCQs (221–230)

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