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Grade 12 Electron Shells & Valence Electrons Worksheet with Answers
Grade 12 (US) · Year 13 (UK) · Class 12 (India) · Chemistry
Unit 1: Structure of MatterAtoms & ElectronsNGSS HS-PS1-1
Arranging electrons in shells for the first 20 elements and finding valence electrons. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.
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Practice Sheetaethelsystems.comElectron Shells & Valence Electrons
Grade 12 · Chemistry
Name
Class
Date
Learning goal: Atoms & Electrons · NGSS HS-PS1-1
Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.
Write the electron arrangement (electrons per shell) for boron, atomic number 5.
Answer: 2, 3
RememberPeriodic table trends
- 1
How many electron shells does a helium atom (atomic number 2) have?
- 2
Write the electron arrangement (electrons per shell) for chlorine, atomic number 17.
- 3
How many electron shells does a hydrogen atom (atomic number 1) have?
- 4
How many electron shells does a aluminum atom (atomic number 13) have?
- 5
Write the electron arrangement (electrons per shell) for neon, atomic number 10.
- 6
Write the electron arrangement (electrons per shell) for magnesium, atomic number 12.
- 7
How many valence electrons does lithium (Li, atomic number 3) have?
- 8
How many valence electrons does oxygen (O, atomic number 8) have?
- 9
How many valence electrons does aluminum (Al, atomic number 13) have?
- 10
How many valence electrons does hydrogen (H, atomic number 1) have?
- 11
How many valence electrons does phosphorus (P, atomic number 15) have?
- 12
Write the electron arrangement (electrons per shell) for aluminum, atomic number 13.
★ Challenge corner for fast finishers
If you could fold a sheet of paper 42 times, roughly how thick would it be?
How did I do?
Teacher's comments
Free printable worksheets with answer keys · aethelsystems.com/worksheets/chemistry/12/electron_config
Answer key — Electron Shells & Valence Electrons (Grade 12)
- 1.1
- 2.2, 8, 7
- 3.1
- 4.3
- 5.2, 8
- 6.2, 8, 2
- 7.1
- 8.6
- 9.3
- 10.1
- 11.5
- 12.2, 8, 3
- ★far enough to reach the Moon (about 440,000 km)
Answer key (click to show)
- 1.1
- 2.2, 8, 7
- 3.1
- 4.3
- 5.2, 8
- 6.2, 8, 2
- 7.1
- 8.6
- 9.3
- 10.1
- 11.5
- 12.2, 8, 3
- ★far enough to reach the Moon (about 440,000 km) (challenge corner)
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