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Just how small is an atom?
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Basic Parts of an Atom, Basic Parts of the Atom - Protons, Neutrons, Electrons, Nucleus - YouTube
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Modeling Atoms How are atoms of elements different from one another?
How does this explain why the periodic table looks the way it does?
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Rules! Protons – positive Electrons – negative
Neutrons – no charge (electrically neutral) ATOMIC NUMBER – ALWAYS TELLS YOU HOW MANY PROTONS ARE IN THE CENTER OF A GIVE ATOM. Find the atomic number of Carbon – put your finger on it! Find the atomic number of Oxygen - put your finger on it!
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ZERO ELECTRIC CHARGE 1 proton + and 1 electron – balance each other out so…… Electrically balanced So the number of protons and electrons equal each other
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How to determine the number of neutrons
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Shells K Shell – 2 electrons L Shell – 8 electrons
M Shell – 18 electrons
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Hydrogen H chemical symbol Colorless, odorless, tasteless gas
Explosive Atomic number = Number of Protons = Number of electrons Atomic mass = Number of neutrons = (Atomic Mass – Atomic number)
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Helium Atomic number = Number of Protons = Number of electrons =
Atomic mass = Number of neutrons = (Atomic Mass – Atomic number)
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Lithium Atomic number = Number of Protons = Number of electrons =
Atomic mass = Number of neutrons = (Atomic Mass – Atomic number)
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Beryllium What is the atomic number of Beryllium? Light silvery metal
Used in steel making
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Boron
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What element is next? All life on Earth is carbon-based. Solid, black
Fossil fuels – coal, oil, natural Gas are combinations of Hydrogen and Carbon Carbohydrates – foods we eat
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Nitrogen Colorless, odorless gas that makes up 78 % of the air we breathe. What are the differences in the properties of gas and carbon? How are the two atoms different
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As the number of protons changes so do the physical and chemical properties!
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Neon – A Noble Gas What do you notice about neon’s outershell?
Neon is an inert gas – it does not react or combine with any other element. Why do you think that is true!
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