structure and bonding

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  • Created by: bxthany
  • Created on: 26-04-14 15:49
what is a compound and how are they made?
when two or more elements react. The atoms of elements join together by sharing/transferring electrons to achieve stable electronic structures
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what is covalent bonding?
when atoms of non-metallic elements join together
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what is ionic bonding?
when metallic and non-metallic elements react
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how many electrons are in the outer shell of atoms of elements in group 1?
1
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why is the compound sodium chloride written as NaCl?
as it has equal sodium ions to chloride ions
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what does the ratio of ions in an ionic compound depends on?
the charges of the ions
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Ionic bonds hold oppositely charged ions together in what?
giant structures (lattices)
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Each ion in a lattic is surrounded by ions of what charge and why?
ions of the opposite charge to hold it firm in place
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why are ionic compounds neutral?
the charges on the ions always cancel each other out
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what does the formula of an ionic compound show?
the ratio of ions present in the compound
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Do atoms of non-metals gain or lose electrons?
gain
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what is a molecule?
a substance with atoms held together by a covalent bond
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when is a covalent bond formed?
when two atoms share a pair of electrons
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what are giant covalent structures (macromolecules)?
atoms that can form several bonds like carbon and join together
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atoms in a metallic element are the same size or difference sizes?
same size
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what happens to electrons in the highest level?
they are delocalised which strongly attracts positive ions and gold the giant structure together
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what holds atoms in metals together?
electrostatic forces
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what do atoms in metal form?
giant structures which layers of atoms are arranged in regular patterns
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Other cards in this set

Card 2

Front

what is covalent bonding?

Back

when atoms of non-metallic elements join together

Card 3

Front

what is ionic bonding?

Back

Preview of the front of card 3

Card 4

Front

how many electrons are in the outer shell of atoms of elements in group 1?

Back

Preview of the front of card 4

Card 5

Front

why is the compound sodium chloride written as NaCl?

Back

Preview of the front of card 5
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