Atoms
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Science, Chemistry
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8th Grade
•
Medium
Standards-aligned
Jodi Edge
Used 1K+ times
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6 Slides • 14 Questions
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Atoms
Review
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Poll
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What are atoms made of?
Atoms are made of Protons and Neutrons, located in the Nucleus, and Electrons around the outside of the nucleus.
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Protons, Neutrons, and Electrons:
Protons and neutrons have mass.
Electrons don't have mass.
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Particle Charges:
Protons are positively charged.
Neutrons are neutrally charged.
Electrons are negatively charged.
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Valence Electrons
Electrons on the outter shell are called "valence electrons."
The first shell can hold 2 electrons.
The 2nd shell can hold 8 electrons.
The 3rd shell can hold 8 electrons.
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Multiple Choice
How many valence electrons in this diagram:
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How many valence electrons in this diagram:
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Multiple Choice
How many valence electrons in this diagram:
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Reactivity
The noble gasses (group 18) are non-reactive.
Group 1 and 17 are the most reactive.
If the atom has 1 valence electron it is easily lost and reacts easily (group 1)
If the atom has 7 valence electrons it wants to grab 1 more and reacts easily (group 17)
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Atoms
Review
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