2: The Periodic Table And Bonding
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What are positive ions called?
Cations.
What holds ionic compounds together?
Electrostatic attraction between ions.
What structure do ionic compounds form?
Giant ionic lattice.
Why don’t ionic compounds conduct electricity when solid?
Ions cannot move.
What do covalent bonds involve?
Sharing pairs of electrons between atoms. The electrons are attracted to the positively charged nuclei
How many bonds do hydrogen chloride (HCl) form?
One covalent bond.
What bond is present in O₂?
A double covalent bond.
How many covalent bonds does methane (CH₄) have?
Four covalent bonds.
What is a property of simple molecular substances?
Low melting and boiling points.
Why does diamond have a high melting point?
It has strong covalent bonds.
What allows metals to conduct electricity?
Delocalised electrons.
Why are metals malleable?
Layers of ions can slide over each other.