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Atomic Basics: 15 MCQs with answers

All 15 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything

Warm-up · 8 questions

Q1. Which subatomic particle carries a negative charge?

Beginner
A Nucleus B Proton C Neutron D Electron
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Electron

Electrons are negatively charged particles that orbit the nucleus.

Q2. The central part of an atom is called the:

Beginner
A Orbit B Nucleus C Shell D Electron cloud
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Nucleus

The nucleus is the dense central core of an atom, containing protons and neutrons.

Q3. Which particle has no electric charge?

Beginner
A Proton B Neutron C Electron D Ion
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Neutron

Neutrons are neutral particles found in the nucleus.

Q4. Which of the following is found outside the nucleus?

Beginner
A Electron B Neutron C Nucleon D Proton
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Electron

Electrons move around the nucleus in shells or orbits.

Q5. Which of the following is NOT a subatomic particle?

Beginner
A Electron B Molecule C Proton D Neutron
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Molecule

A molecule is a group of atoms, not a subatomic particle.

Q6. The shell closest to the nucleus is called the:

Beginner
A N shell B M shell C K shell D L shell
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K shell

The first shell, nearest to the nucleus, is the K shell.

Q7. Protons are negatively charged particles.

Beginner
A True B False
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False

Protons are positively charged; electrons are negatively charged.

Q8. The nucleus of an atom contains protons and neutrons.

Beginner
A True B False
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True

The nucleus is made up of protons and neutrons.

Building up · 7 questions

Q9. The atomic number of an element is equal to the number of:

Intermediate
A Protons B Protons plus neutrons C Neutrons D Electrons plus neutrons
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Protons

Atomic number is defined as the number of protons in an atom.

Q10. The mass number of an atom is the sum of:

Intermediate
A Protons and electrons B Only protons C Neutrons and electrons D Protons and neutrons
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Protons and neutrons

Mass number = number of protons + number of neutrons.

Q11. Which of the following atoms has 6 protons?

Intermediate
A Nitrogen B Oxygen C Carbon D Hydrogen
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Carbon

Carbon has atomic number 6, so it has 6 protons.

Q12. The maximum number of electrons that can be accommodated in the first shell (K shell) is:

Intermediate
A 32 B 8 C 18 D 2
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2

The first shell can hold a maximum of 2 electrons.

Q13. Which subatomic particle determines the identity of an element?

Intermediate
A Proton B Electron C Neutron D Positron
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Proton

The number of protons (atomic number) defines the element.

Q14. An atom is electrically neutral because:

Intermediate
A Electrons are neutral B It has no charged particles C Number of protons equals number of electrons D Number of neutrons equals number of protons
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Number of protons equals number of electrons

Equal numbers of positive protons and negative electrons cancel out, making the atom neutral.

Q15. If an atom has 11 protons and 12 neutrons, its mass number is:

Intermediate
A 12 B 1 C 23 D 11
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23

Mass number = protons + neutrons = 11 + 12 = 23.

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