What mantle is forced down and begins to melt?

HELP!

The reaction q+r2=r2q is found to be first order in r2 and

What will most likely happen when two bromine atoms bond together?

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?