Chemistry. Atom bonding

Cards that help learn the different types of bonding: ionic and covalent.

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  • Created by: Becky
  • Created on: 04-12-12 08:33

Covalent bonding

defintion= strong bond of sharing a pair of elctrons between 2 non-metal atoms.

Atoms can share more than one pair of electrons! These make double (or more bonds) these molecules are called unsaturated and are more reactive than saturated electrons.

Shown with dot and cross, structral formula (eg ethene= CH2CH2) or ball and stick models.

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Ionic bonding

defintion= attraction between ions. Ions are positively or negatively charged atoms which are cause by losing electrons an becoming positive or gaining eletrons and becoming negative.

High melting and boiling points.

Metal atoms lose elctrons and become positively charged, Non-metal atoms gain electrons and become negatively charged.

These can be shown in dot and cross diagrams and each ion is in brackets with its charge on the outside (eg2+)

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metallic bonding

defintion= a regular formation of positevly charge metal ions surround by a sea of negative delocalised electrons.

High melting and boiling points.

You need to make sure you draw the correct number of electrons for that number of ions. The delocalised electrons are all of the electrons in the outer shell of the ion!

Delocalised electrons can flow which is why metals can conduct electricity.

The more delocalised electrons then the stornger the bond is therefore it has a higher melting and boiling point.

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