Which subatomic particle identifies an atom as that of a particular element? how is this particle related to the atoms atomic number

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5