hydrogen 1p+, 1e _ helium 2p+, 2e _ electron proton neutron the atom
Post on 22-Dec-2015
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Hydrogen1p+, 1e_
Helium2p+, 2e_
electron
proton
neutron
The Atom
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Sub Atomic Particles
Name Mass Charge Location
Proton 1 AMU + 1 Nucleus
Neutron 1 AMU N/A Nucleus
Electron N/A -1 Electron
Cloud
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Carbon6p+, 6e_
Oxygen8p+, 8e_
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Molecules• Chemical bonds hold together two or more
atoms of the same or different elements– Ex: Nitrogen gas: N2
• Chemical bond: a union between the electron clouds of two atoms
• Molecules of compounds-elements in proportions never vary.
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SODIUMATOM11 p+
11 e-
electron transfer
CHLORINEATOM17 p+
17 e-
SODIUMION
11 p+
10 e-
CHLORINEION
17 p+
18 e-
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Do not post photos to Internet1 mm
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Molecular Hydrogen(H2)
Molecular Oxygen(O2)
Water (H2O)
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Covalent bonding
Click to view animation.
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Water molecule Ammonia molecule
Hydrogen bond
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H H
O
Slight negative charge at this end
Slight positive charge at this end
No overall charge
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Multiple H bonds holding two molecules together
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Liquid water Ice
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In-text FigurePage 20
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Na+
Cl–
– –
––
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–
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– –
+ ++
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cohesion
evaporation