Test: Atoms

Instructions: Please answer the following questions by selecting the correct option or filling in the blank.

1. What is an atom?
a) The smallest unit of matter that retains the properties of an element.
b) A type of molecule.
c) A subatomic particle.

2. What are the three main subatomic particles that make up an atom?
a) Protons, neutrons, and electrons.
b) Electrons, positrons, and neutrons.
c) Protons, electrons, and photons.

3. Which subatomic particle carries a positive charge?
a) Proton.
b) Electron.
c) Neutron.

4. Which subatomic particle carries a negative charge?
a) Proton.
b) Electron.
c) Neutron.

5. Which subatomic particle is located in the nucleus of an atom?
a) Proton.
b) Electron.
c) Neutron.

6. What is the charge of an electron?
a) Positive.
b) Negative.
c) Neutral.

7. What is the charge of a proton?
a) Positive.
b) Negative.
c) Neutral.

8. What is the charge of a neutron?
a) Positive.
b) Negative.
c) Neutral.

9. What is the atomic number of an atom?
a) The total number of protons in the nucleus.
b) The total number of neutrons in the nucleus.
c) The total number of electrons in the nucleus.

10. What is the atomic mass of an atom?
a) The total number of protons in the nucleus.
b) The total number of neutrons in the nucleus.
c) The combined mass of protons and neutrons in the nucleus.

11. Which part of the atom determines its chemical properties?
a) Protons.
b) Electrons.
c) Neutrons.

12. How are elements arranged on the periodic table?
a) By atomic mass.
b) By atomic number.
c) By the number of neutrons.

13. What is an isotope?
a) Atoms of the same element with different numbers of neutrons.
b) Atoms of different elements.
c) Atoms with an equal number of protons and neutrons.

14. What is the maximum number of electrons that can occupy the first energy level of an atom?
a) 2.
b) 8.
c) 18.

15. What is the maximum number of electrons that can occupy the second energy level of an atom?
a) 2.
b) 8.
c) 18.

16. What is the maximum number of electrons that can occupy the third energy level of an atom?
a) 2.
b) 8.
c) 18.

17. What is the symbol for the element carbon?
a) H.
b) C.
c) Ca.

18. What is the symbol for the element oxygen?
a) O.
b) C.
c) Ca.

19. What is the symbol for the element hydrogen?
a) H.
b) C.
c) He.

20. What is the symbol for the element helium?
a) H.
b) C.
c) He.

Answers:
1. a) The smallest unit of matter that retains the properties of an element.
2. a) Protons, neutrons, and electrons.
3. a) Proton.
4. b) Electron.
5. a