+20 Questions on Atom
20 multiple choice questions about the atom, suitable for middle or high school students. The answers are provided at the end.
Multiple Choice Questions: The Atom
1. What is the basic unit of matter?
A) Molecule
B) Proton
C) Atom
D) Ion
2. Which particles are found in the nucleus of an atom?
A) Electrons only
B) Protons and neutrons
C) Neutrons and electrons
D) Protons and electrons
3. What is the charge of a proton?
A) Negative
B) Neutral
C) Positive
D) No charge
4. What is the charge of an electron?
A) Positive
B) Negative
C) Neutral
D) No charge
5. Which subatomic particle has no charge?
A) Proton
B) Neutron
C) Electron
D) Positron
6. Where are electrons located in an atom?
A) Inside the nucleus
B) Orbiting the nucleus
C) In the proton cloud
D) Inside neutrons
7. What determines the atomic number of an element?
A) Number of protons
B) Number of neutrons
C) Number of electrons
D) Total mass of the atom
8. Which part of the atom has the least mass?
A) Proton
B) Neutron
C) Electron
D) Nucleus
9. Which two particles have approximately the same mass?
A) Proton and electron
B) Neutron and electron
C) Proton and neutron
D) Electron and nucleus
10. If an atom has 6 protons, what element is it?
A) Oxygen
B) Helium
C) Carbon
D) Nitrogen
11. What is the total charge of a neutral atom?
A) Positive
B) Negative
C) Zero
D) Depends on the element
12. What is the mass number of an atom?
A) Number of protons
B) Number of electrons
C) Number of protons + neutrons
D) Number of neutrons
13. What do we call atoms of the same element with different numbers of neutrons?
A) Ions
B) Isotopes
C) Molecules
D) Electrons
14. What is an ion?
A) Atom with extra nucleus
B) Atom with different number of neutrons
C) Atom with a net charge
D) Atom without electrons
15. Who proposed the modern model of the atom with a dense nucleus?
A) Dalton
B) Bohr
C) Rutherford
D) Mendeleev
16. Which scientist discovered the electron?
A) Rutherford
B) Bohr
C) Thomson
D) Chadwick
17. What happens to an atom if it gains an electron?
A) Becomes positively charged
B) Becomes an isotope
C) Becomes negatively charged
D) Loses mass
18. What is the nucleus of an atom made of?
A) Electrons
B) Protons and neutrons
C) Ions
D) Neutrons and electrons
19. Which of the following is true about electrons?
A) They are heavier than neutrons
B) They have a positive charge
C) They are located in energy levels
D) They are found in the nucleus
20. What is the term for the space where electrons are likely to be found?
A) Nucleus
B) Electron field
C) Orbit
D) Electron cloud
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Answer Key
1. C) Atom
2. B) Protons and neutrons
3. C) Positive
4. B) Negative
5. B) Neutron
6. B) Orbiting the nucleus
7. A) Number of protons
8. C) Electron
9. C) Proton and neutron
10. C) Carbon
11. C) Zero
12. C) Number of protons + neutrons
13. B) Isotopes
14. C) Atom with a net charge
15. C) Rutherford
16. C) Thomson
17. C) Becomes negatively charged
18. B) Protons and neutrons
19. C) They are located in energy levels
20. D) Electron cloud
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