out of metallic, ionic and covalent what is the strongest type of bond and why?
thanks
That's actually a very dodgy kind of question as technically, all three are variants on the same theme. Ionic and covalent bonds only really differ in how polar the bond is (how large the electronegativity difference is) and metallic, covalent bonds both involve overlap of orbitals.
You don't need to know the above for VCE btw
In terms of the types of bonding commonly seen though, all three types of bonds are strong. It depends on the atoms really. Like, there are very weak covalent bonds (like F-F bonds, will react with almost anything), very weak metallic bonds (think caesium which melts at room temperature) and very weak ionic bonds (look up ionic liquids on Wiki for a list of these). In contrast, there are also strong covalent bonds (diamond), ionic bonds (sodium and lithium fluoride) and metallic bonds (titanium metal). All of these have melting points around or over 1000 degrees.
say ive got to elements (making up charges)
Cl^2- and (SO4)2^- , how does the cross over rule work?
What cross over rule?