Atomic Structure MCQs with Answers

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Atomic Structure Online Quiz

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• Test Name: Atomic Structure MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Atomic Structure

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1 / 40

What particles are found in the nucleus of an atom?

Protons and neutrons

Electrons and protons

Neutrons and electrons

2 / 40

Who proposed the planetary model of the atom?

Niels Bohr

Ernest Rutherford

J.J. Thomson

3 / 40

Which particle orbits the nucleus of an atom?

Proton

Electron

Neutron

4 / 40

What is the charge of a proton?

Neutral

Negative

Positive

5 / 40

What is the electron configuration of an atom?

The distribution of electrons in an atom's orbitals

The arrangement of protons and neutrons in the nucleus

The arrangement of atoms in a molecule

6 / 40

How many f orbitals are there in an f sublevel?

5

7

3

7 / 40

What is the central part of an atom called?

Nucleus

Electron cloud

Shell

8 / 40

Who discovered the electron?

J.J. Thomson

Niels Bohr

Ernest Rutherford

9 / 40

What is the atomic number of an element?

Number of neutrons

Number of protons

Number of electrons

10 / 40

How many electrons can the first energy level hold?

18

8

2

11 / 40

What is an anion?

A positively charged ion

A neutral atom

A negatively charged ion

12 / 40

What happens when an electron moves to a higher energy level?

It releases energy

It absorbs energy

It loses mass

13 / 40

What does Hund's rule state?

Electrons occupy orbitals of equal energy singly first

No two electrons can have the same set of quantum numbers

Electrons fill the lowest energy orbitals first

14 / 40

What is the shape of an s orbital?

Cloverleaf-shaped

Dumbbell-shaped

Spherical

15 / 40

What does the Pauli exclusion principle state?

No two electrons can have the same set of quantum numbers

Electrons occupy orbitals of equal energy singly first

Electrons fill the lowest energy orbitals first

16 / 40

What is a cation?

A neutral atom

A positively charged ion

A negatively charged ion

17 / 40

What model of the atom did J.J. Thomson propose?

Planetary model

Plum pudding model

Quantum mechanical model

18 / 40

What are the energy levels where electrons reside called?

Shells

Nuclei

Orbitals

19 / 40

What is the principal quantum number?

Describes the shape of an orbital

Describes the energy level of an electron

Describes the orientation of an orbital

20 / 40

How many electrons can the second energy level hold?

2

8

18

21 / 40

What is the ground state of an atom?

An excited state of the atom

A state where the atom has lost an electron

The lowest energy state of the atom

22 / 40

What is an isotope?

Atoms with the same number of neutrons but different numbers of protons

Atoms with the same number of protons but different numbers of neutrons

Atoms with the same number of electrons but different numbers of protons

23 / 40

What is the maximum number of electrons that can occupy a single orbital?

1

3

2

24 / 40

What is the shape of a p orbital?

Dumbbell-shaped

Spherical

Cloverleaf-shaped

25 / 40

What is the charge of an electron?

Positive

Neutral

Negative

26 / 40

What is an orbital?

The nucleus of an atom

A region of space where there is a high probability of finding an electron

The path of an electron around the nucleus

27 / 40

What is the relative mass of a proton compared to an electron?

Approximately 1836 times

Approximately 100 times

Approximately 2000 times

28 / 40

What are valence electrons?

Electrons in the nucleus

Electrons in the innermost energy level

Electrons in the outermost energy level

29 / 40

Which rule states that electrons fill the lowest energy orbitals first?

Aufbau principle

Pauli exclusion principle

Hund's rule

30 / 40

What is the mass number of an element?

Sum of electrons and protons

Sum of protons and neutrons

Sum of electrons and neutrons

31 / 40

How many electrons can the third energy level hold?

2

8

18

32 / 40

How many p orbitals are there in a p sublevel?

1

3

5

33 / 40

Who conducted the gold foil experiment?

Ernest Rutherford

Niels Bohr

J.J. Thomson

34 / 40

What did Rutherford's gold foil experiment demonstrate?

The presence of electrons

The existence of isotopes

The existence of a small, dense nucleus

35 / 40

What happens when an electron falls back to a lower energy level?

It releases energy

It absorbs energy

It gains mass

36 / 40

What does the Heisenberg uncertainty principle state?

Electrons fill the lowest energy orbitals first

It is impossible to know both the position and momentum of an electron simultaneously

Electrons occupy orbitals of equal energy singly first

37 / 40

What determines the chemical properties of an element?

Electron configuration

Number of protons

Number of neutrons

38 / 40

How many d orbitals are there in a d sublevel?

7

3

5

39 / 40

What is the charge of a neutron?

Positive

Neutral

Negative

40 / 40

What is an ion?

An atom that has gained or lost neutrons

An atom that has gained or lost protons

An atom that has gained or lost electrons

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