number 8 the list is hydrogen,magnesium,silicon and oxygen and there are 4elements
Corresponding in size or amount to something else.
A polyatomic ion is a group of elements that has a charge that is not 0. for example the charge of P04 is -3
(1) The melting of a crystalline solid is best depicted by the second graph. This is because, the second graph shows a horizontal line which means that for a while there was no change in temperature. This zone is the latent heat of fusion.
(2) The first graph shows the graph of a solid that is just heated but does not experience phase change. However, the second graph shows a solid that changes phase (from crystal/solid to liquid).
