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10 Cards in this Set
- Front
- Back
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Define the term- covalent bonds |
When a pair of electrons are shared between non-metal atoms |
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what do molecular substances contain |
A group of atoms that are held together by covalent bonds |
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Define the term- molecular formula |
The number of atoms of each element bonded together in a simple molecule |
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Why do atoms become more stable when bonds form |
They can share electrons to complete outer shells |
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State three formulas for presenting molecules |
Molecular formula Structural formula Dot & cross formula |
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Define the term- valency |
The number of covalent bonds formed by an atom of different elements |
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Valency= |
Total number of electrons- number of electrons in atoms outer shell |
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Work out the valency of Fluorine (group 7) Carbon (group 4) |
Fluorine (group 7): 8 - 7= 1 valency Carbon (group 4): 8 - 4 = 4 valency |
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Give one example of a double covalent bond |
1 oxygen atom bonded to 2 hydrogen atoms |
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The atoms in a _______ are held together by _______ __________ ___________ of ______________ between _________ nuclei and negative ____________ |
Molecules Strong electrostatic forces of attraction Positive Electrons |
