What is the only noble gas that does not have 8 valence electrons?
CHEMISTRY TEST SPRING 2025

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•
Chemistry
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Helium (He) has 2 valence electrons.
2.
FLASHCARD QUESTION
Front
What is NaHCO₃ an example of?
Back
NaHCO₃ is an example of a compound.
3.
FLASHCARD QUESTION
Front
What type of reaction is represented by BC -> B + C?
Back
This is a decomposition reaction.
4.
FLASHCARD QUESTION
Front
In the formula 4CF₂Cl₂, how many atoms of each element are present?
Back
C = 4, F = 8, Cl = 8.
5.
FLASHCARD QUESTION
Front
Is the equation Al + O₂ → 2Al₂O₃ balanced?
Back
No, the equation is not balanced.
6.
FLASHCARD QUESTION
Front
What are valence electrons?
Back
Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.
7.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more elements chemically bond together.
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