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6744015
Chemistry C2
Descripción
A*-C grade
Sin etiquetas
chemistry
chemistry unit 2
chemistry
gcse
Mapa Mental por
Sophie McDermott
, actualizado hace más de 1 año
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Creado por
Sophie McDermott
hace alrededor de 8 años
15
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Resumen del Recurso
Chemistry C2
Structures & Bonding
An atom is made up of subatomic particles
Protons
Charge : +1
Neutrons
They have no charge
Electrons
The first shell can hold 2 electrons
The second & third shell can hold 8 electrons
The forth shell can hold 18 electrons
Charge : -1
Ionic bonding
When atoms gain or lose electrons
Happens between a metal and a non-metal
Ionic compunds are very strong because the positive and negative ions are attracted to each other
Metal gets positive charged but the non metal gets negatively charged
Have high melting and boiling points
Soluable in water
Bad conductors as solid
Covalent bonding
Between 2 non-metal
Poor conductors
Exist as liquid or gasses at room temperature
Share electrons
Low melting points
All atoms gain a full outer shell
Between the bonds are intermolecular forces which are very strong
Metallic bonding
Between 2 metals
There are free electrons
Become positive charged
Donate their electrons
Very high boiling and melting points
Good conductors
Aren't very soluable
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