Electron Arrangements Worksheet
Explore electron shells, valence electrons, and orbital diagrams for Grade 9 Science students.
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Electron Arrangements Worksheet
Name:
Date:
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. What is the maximum number of electrons that can occupy the first electron shell?
2
8
18
32
2. Which of the following elements has 7 valence electrons?
Oxygen
Nitrogen
Chlorine
Carbon
3. Electrons occupy specific energy levels called around the nucleus.
4. The outermost electron shell of an atom is called the shell.
5. Atoms tend to gain, lose, or share electrons to achieve a stable outer shell with eight electrons, a rule known as the rule.
6. Draw a Bohr model diagram for a Sodium atom (Na), which has 11 protons and 11 electrons. Clearly label the nucleus and electron shells.
7. Explain the difference between core electrons and valence electrons.
Match the term on the left with its definition on the right.
8. Electron Shell
a. The electrons in the outermost shell
9. Valence Electrons
b. A region around the nucleus where electrons are likely to be found
10. Octet Rule
c. States that atoms tend to have eight electrons in their outermost shell
11. All elements follow the octet rule.
True
False
12. Electron shells are also known as energy levels.
True
False
Use the words below to complete the sentences.
13. Electrons are found in electron around the .
14. The chemical properties of an atom are primarily determined by its electrons, which are located in the outermost electron .
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