bonding, structure and properties of matter

• metals form positive ions
• non-metals form negative ions (if at all)
• alkali metals reactivity increase as you go down the group
• metals are malleable
• metals are conductors of heat and electricity
• non-metals are dull in colour
• transition metals can form more than one ion
• alkali metals have low density and low melting point
• are alkali metals hard or soft

  soft
• halogens are diatomic molecules
• halogens form covalent bonds with themselves
• halogens reactivity decreases as you go down the group
• halogens melting and boiling point increase as you go down the group
• when a halogen gains an electron, it is called a halide
• halogens can form ionic bonds with alkali metals
• more reactive halogens displace less reactive ones
• noble gases are inert
• noble gases boiling point increase as you go down the group
• ionic compounds have high melting and boiling points
• what is the charge of a sulfate ion

  2-
• what is the charge of a hydroxide ion

  -
• covalent bonds are the share of electrons