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Grade 10 Electron Shells & Valence Electrons Worksheet with Answers

Grade 10 (US) · Year 11 (UK) · Class 10 (India) · Science

Unit 1: Atomic StructureElectronsNGSS 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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Electron Shells & Valence Electrons

Grade 10 · Science

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Class

Date

Learning goal: Electrons · NGSS HS-PS1-1

Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.

Example

Write the electron arrangement (electrons per shell) for lithium, atomic number 3.

Answer: 2, 1

RememberPeriodic table trends

1
How many electron shells does a beryllium atom (atomic number 4) have?
2
How many valence electrons does carbon (C, atomic number 6) have?
3
How many electron shells does a hydrogen atom (atomic number 1) have?
4
Write the electron arrangement (electrons per shell) for aluminum, atomic number 13.
5
How many electron shells does a sodium atom (atomic number 11) have?
6
How many electron shells does a lithium atom (atomic number 3) have?
7
How many electron shells does a sulfur atom (atomic number 16) have?
8
How many electron shells does a oxygen atom (atomic number 8) have?
9
How many electron shells does a silicon atom (atomic number 14) have?
10
Write the electron arrangement (electrons per shell) for magnesium, atomic number 12.
11
How many valence electrons does sulfur (S, atomic number 16) have?
12
How many electron shells does a nitrogen atom (atomic number 7) have?

★ Challenge corner for fast finishers

Why do you see lightning before you hear thunder?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/10/electron_config

Answer key (click to show)

1.2
2.4
3.1
4.2, 8, 3
5.3
6.2
7.3
8.2
9.3
10.2, 8, 2
11.6
12.2
★light travels much faster than sound (challenge corner)

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