If it has a metal and a nonmetal bonded together it is an ionic bond. you are looking for non-metal non-metal bond. those are all covalent bonds. answer is B
Density = mass divided by volume. 15/30 is 1/2 so the density is 1/2 or 0.5 g/cm
Liquid is water or drink and solid is hard
Bromine is a chemical element with the symbol Br and atomic number 35.
I'm assuming you meant 10^(14) instead of 1014
if so, then the energy of one photon will be be 4.76×10^(-19) Joules