Atomic Structure
Atomic Structure Quiz – Atoms, Nucleus, Protons, Neutrons & Electrons
20 questions · 15 min · Medium
Atomic Structure Quiz – Atoms, Elements and Compounds
Test your knowledge of atomic structure, atoms, elements, compounds, chemical symbols, chemical formulae, and chemical reactions with these chemistry multiple-choice questions.
- 20
- Questions
- 15 min
- Time limit
- Easy
- Difficulty
No sign-up needed · Last updated:
Score: 0 00:00
Save your score
Create a free account to keep your scores and track your progress. It is optional.
Questions to review
Related quizzes
Atomic Structure
Atomic Structure Quiz – Atomic Radius, Nucleus, Protons, Neutrons, Electrons & Isotopes
20 questions · 15 min · Medium
Atomic Structure
Chemistry Quiz – Atomic Structure and Subatomic Particles
22 questions · 17 min · Medium
Atomic Structure
Atomic Structure Quiz – Atoms, Nucleus, Protons, Neutrons & Electrons
19 questions · 15 min · Easy
All 20 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
-
1. All substances are made of
- A. atoms
- B. formulae
- C. sodium
- D. chemical reactions
Show answer
A. atoms
All substances are made up of atoms. Atoms are the basic building blocks of matter.
-
2. An atom is the smallest part of an element that can exist.
- A. formulae
- B. smallest part of an element
- C. chemical reaction
- D. compound
Show answer
B. smallest part of an element
An atom is the smallest unit of an element that retains the chemical properties of that element.
-
3. Atoms of each element are represented by a
- A. chemical symbol
- B. chemical formula
- C. compound
- D. chemical reaction
Show answer
A. chemical symbol
Each element is represented by a chemical symbol. For example, O represents oxygen and Na represents sodium.
-
4. O represents an atom of
- A. oxygen
- B. new substances
- C. one type of atom only
- D. sodium
Show answer
A. oxygen
The chemical symbol O represents the element oxygen.
-
5. Na represents an atom of
- A. sodium
- B. oxygen
- C. nitrogen
- D. neon
Show answer
A. sodium
Na is the chemical symbol for sodium. The symbol comes from the Latin name for sodium, natrium.
-
6. There are about 100 different
- A. elements
- B. atoms
- C. compounds
- D. chemical reactions
Show answer
A. elements
There are about 100 naturally occurring and known chemical elements. Each element contains atoms with the same number of protons.
-
7. An element is a substance that contains
- A. one type of atom only
- B. word equations
- C. chemical equations
- D. oxygen
Show answer
A. one type of atom only
An element is a pure substance made up of only one type of atom.
-
8. Elements are shown in the
- A. chemical reactions
- B. smallest part of an element
- C. periodic table
- D. water
Show answer
C. periodic table
The periodic table organizes all known chemical elements according to their atomic number and other properties.
-
9. Compounds are formed from elements by chemical reactions.
- A. elements
- B. atoms
- C. compounds
- D. chemical symbols
Show answer
C. compounds
Compounds are substances formed when atoms of two or more different elements chemically combine.
-
10. Chemical reactions always involve the formation of one or more
- A. chemical reactions
- B. new substances
- C. elements
- D. atoms
Show answer
B. new substances
A chemical reaction produces one or more new substances with different properties from the original substances.
-
11. Chemical reactions often involve a detectable
- A. new substance
- B. energy change
- C. chemical symbol
- D. periodic table
Show answer
B. energy change
Chemical reactions often involve an energy change. Energy may be released or absorbed during a reaction.
-
12. Compounds contain two or more elements combined together in fixed proportions.
- A. two or more elements combined together
- B. one type of atom only
- C. chemical reactions only
- D. one element and one atom
Show answer
A. two or more elements combined together
A compound contains atoms of two or more different elements chemically combined in fixed proportions.
-
13. Compounds can be represented by
- A. compounds
- B. chemical formulae
- C. chemical reactions
- D. word equations
Show answer
B. chemical formulae
Chemical formulae represent compounds using the symbols of the elements present and numbers showing their proportions.
-
14. The chemical formula of the compound CO₂ is
- A. carbon dioxide
- B. chemical symbol
- C. formulae
- D. periodic table
Show answer
A. carbon dioxide
CO₂ is the chemical formula for carbon dioxide. It contains one carbon atom and two oxygen atoms.
-
15. The chemical formula of the compound H₂O is
- A. methane
- B. water
- C. ammonia
- D. carbon dioxide
Show answer
B. water
H₂O is the chemical formula for water. Each molecule contains two hydrogen atoms and one oxygen atom.
-
16. The chemical formula of the compound NH₃ is
- A. ammonia
- B. water
- C. methane
- D. carbon dioxide
Show answer
A. ammonia
NH₃ is the chemical formula for ammonia. It contains one nitrogen atom and three hydrogen atoms.
-
17. The chemical formula of the compound CH₄ is
- A. carbon dioxide
- B. water
- C. methane
- D. ammonia
Show answer
C. methane
CH₄ is the chemical formula for methane. It contains one carbon atom and four hydrogen atoms.
-
18. Compounds can only be separated into elements by
- A. chemical reactions
- B. atoms
- C. formulae
- D. compounds
Show answer
A. chemical reactions
The elements in a compound are chemically bonded together, so they can only be separated by chemical reactions rather than simple physical methods.
-
19. Chemical reactions can be represented by
- A. chemical reactions
- B. word equations
- C. atoms
- D. periodic tables
Show answer
B. word equations
Word equations describe chemical reactions using the names of the reactants and products.
-
20. Chemical reactions can also be represented by equations using symbols and formulae (chemical equations).
- A. word equations
- B. chemical equations
- C. chemical symbols
- D. compounds
Show answer
B. chemical equations
Chemical equations represent reactions using chemical symbols and formulae. They show the reactants and products involved in a chemical reaction.