4/14 chemical bonding and structure
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which elements have ionic bonding
metals : non metals
which elements have covalent bonding
non-metals
what elements have metallic bonding
metals
important point of ionic bonding
electron transfer
important point of covalent bonding
shared pair of electrons
important point of metallic bonding
sea of deloaclised electrons
an ionic bond is…
electrostatic attraction
a covalent bond is…
shared pair of electrons
a metallic bond is…
sea of delocalised electrons
melting point of ionic bond
high (must break all ionic bonds)
melting point of covalent giant
high (must break all covalent bonds)
melting point of covalent molecular
low (often gas at room temp) must only break intermolecular forces)
melting point of metallic
high
do ionic compounds conduct electricity
molten can, solid cannot
do covalent compounds conduct electrivity
no
do metallic compounds conduct electricity
yes
what is moving when electricity is conducted in ionic
the ions as they have been made free to move
what is moving when electricity is conducted in metallic
the delocalised electrons
what is electronegativity
the measure of the attraction of the atom for a shared pair of electrons
what does the difference in electronegativity determine
the type of bonding that takes place between atoms
a large difference in electronegativity results in
the formation of an ionic bond
a small difference in electronegativity results in
the formation of a covalent bond
≥ 1.8 units type of bonding
ionic
0.5-1.7 units type of bonding
polar covalent