How is the light emitted by an atom related to its electron configuration?

i've been struggling to figure out how exactly to answer this. i believe it has something to do with the electrons becoming excited and changing orbitals, but that's all i've really got..

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

What is a difference between a mixture of elements and a mixture of compounds

Who discovered a pattern to the elements in 1869?