Silicon melt at 1410 degree celsius. phosphonus melt at 44 degree celsius. Explain the difference in these melting point by referring to forces between the particles and energy.

Which best describes how johannes kepler developed his laws of planetary motion

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?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?