C1 - ATOMS

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What is an Element?
substance made up of only one type of atom
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What is a Compound?
substance made when 2 or more elements are chemically bonded together
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Proton
found in nucleus, relative charge (+1), relative mass (1)
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Neutron
found in nucleus, relative charge (0), relative mass (1)
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Electron
orbits nucleus, relative charge (-1), relative mass (close to 0)
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Why does an atom have no overall charge?
Because the no. of protons (which are positive) is equal to the no. of electrons (which are negative)
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What is the overall charge of the NUCLEUS ?
positive
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Electrons
-arranged around nucleus in shells -> each shell represents a different energy level -> the higher the energy level, the farthest from the nucleus
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What the a group number of an element tell you?
how many electrons it has in its outershell
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Group 0 elements / "Noble Gases"
they are unreactive bc their atoms have a stable arrangements of electrons (they have a complete outershell)
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Forming Ions
Metal atoms -> positive ions // Non-metal ions -> negative ions
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Explain ionic bonding
opposite charges attract each other -> therefore there are strong attractions between the positive and negative ions in metal + non-metal compound
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As no new atoms are created or destroyed...
TOTAL MASS OF REACTANTS = TOTAL MASS OF PRODUCTS
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Other cards in this set

Card 2

Front

What is a Compound?

Back

substance made when 2 or more elements are chemically bonded together

Card 3

Front

Proton

Back

Preview of the front of card 3

Card 4

Front

Neutron

Back

Preview of the front of card 4

Card 5

Front

Electron

Back

Preview of the front of card 5
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