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Printed: December 17, 2023
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Elements and compounds Worksheet
Visit CK12.org for Free Online Practice
1. Atoms are circular in structure with well defined boundaries.
a. TRUE
b. FALSE
2. What is an element?
a. An element is the simplest form of a chemical.
b. An element is a pure substance.
c. An element is an atom.
3. An ion is an electrically charged atom. A hydrogen ion is just a proton. Why?
a. It has gained a proton.
b. It has lost its neutron.
c. It has lost its electron.
d. It has gained an electron.
4. Fill in the blank(s):
A chemical ____________________ is a process that changes some chemical substance into another.
5. Fill in the blank(s):
The number of ____________________ in an atom’s nucleus determine the type of atom.
6. If an electrically neutral atom has 57 protons, how many electrons does it have?
Answer:
2
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7. In an atom, where are the electrons found?
a. anywhere
b. in the nucleus
c. surrounding the nucleus
8. Can an element be broken down into other substances?
a. YES
b. NO
9. Each element is made of just one type of atom.
a. TRUE
b. FALSE
10. Select all possible answers:
Which of the following are examples of chemical substances?
a. water
b. table sugar
c. table salt
d. alcohol
3
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Answer Keys
1. FALSE
2. An element is a pure substance.
3. It has lost its electron.
4. reaction
5. protons
6. 57
7. surrounding the nucleus
8. NO
9. TRUE
10. water , table sugar , table salt , alcohol
4
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