Counting Valence Electrons
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Objective
I can determine the number of valence electrons for an atom.
Part 1 of 4
Warm-up video
Free Animated Education · 3:25
We don't generate video — this one is by Free Animated Education on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
Electrons are arranged in specific shells around the nucleus, with the first shell, closest to the nucleus, holding a maximum of 2 electrons.
- 2
The second electron shell can hold a maximum of 8 electrons, and for atoms with an atomic number up to 20, the third shell also holds up to 8 electrons.
- 3
The outermost shell of an atom is called the valence shell, and the electrons located in this shell are known as valence electrons.
Part 3 of 4
Practice
12 questions
What are the three main subatomic particles that make up an atom?
Where are electrons found within an atom?
Part 4 of 4
Exit ticket
Quick comprehension check
“An atom of phosphorus has an atomic number of 15. Based on the electron shell rules discussed, determine the number of valence electrons for a phosphorus atom.”
Sample answer included in the free materials
Get the materials
Teacher guide, student handout, and slides — free, in Google Docs format
Teacher Guide
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Student Handout
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