Ionic metallic and covalent bonds are examples of what type of forces

Ithink the answers is b i hope it my friend message me if i’m wrong and i’ll change my answer and fix it for you

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

The density of the block of iron is lees than the density of mercury but the density of the block of iron is greater than the density of water