C2 1 Structure and bonding

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  • Created by: jkav
  • Created on: 18-04-14 11:24
What is a compound?
A substance made of two or more elements that have reacted together or that are chemically bonded together
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Which electrons in an atom are involved in bonding?
Outer electrons (electrons in the highest occupied energy level or outer shell)
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What happens to the electrons in atoms when ionic bonds are formed?
They are transferred or metal atoms lose electrons and non - metal atoms gain electrons.
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What happens to electrons in atoms when covalent bonds are formed?
They are shared. For each covalent bond one pair of electrons is shared.
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Why do the elements in Group 1 form ions with a single positive charge?
They lose thier one outer shell electron (one electron in the highest occupied energy level or outer shell)
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Why do the elements in Group 7 form ions with a single negative charge?
They gain one electron so their outer shell has eight electrons or so they have the structure of a noble gas
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Why do ionic compounds have giant structures?
The attractive forces between oppositely charges ions act all directions, so the ions pack closely together in a regular arrangement (lattice), ions are very small so a crystal contains many ions.
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Explain why silicon (in Group 4) has a giant structure
Silicon atom form four covalent bonds, each silicon atom can join to four others, the bonds are strong; this continues so that a giant structure is formed.
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Explain how the atoms in a piece of sodium metal are held together
The outer electrons delocalise, leaving a lattice of positive ions; the delocalise electrons attract the positive ions; the electrostatic forces are strong, and these hold the ions in position
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Other cards in this set

Card 2

Front

Which electrons in an atom are involved in bonding?

Back

Outer electrons (electrons in the highest occupied energy level or outer shell)

Card 3

Front

What happens to the electrons in atoms when ionic bonds are formed?

Back

Preview of the front of card 3

Card 4

Front

What happens to electrons in atoms when covalent bonds are formed?

Back

Preview of the front of card 4

Card 5

Front

Why do the elements in Group 1 form ions with a single positive charge?

Back

Preview of the front of card 5
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