The weakest type of bridge would be a board across gully.
London dispersion forces are the weakest type of chemical bonding.
Torkoal is the weakest Fire Type Pokemon Ash has.
sedimantary
acid
Gamma radiation is the strongest, followed by beta, followed by alpha. So, in answer to your question; alpha is the weakest type of radiation :)
on outer ear
ikr
Hydrogen
pine wood
Hydrogen bonding between polar molecules creates the weakest bonds.
Water molecules are associated by hydrogen bonds but I suppose that these bonds are not the weakest.