Which of the following cannot be read directly from the periodic table? an element's atomic mass
an element's number of neutrons
an element's symbol
an element's number of protons

Many ionic compounds and a few highly polar covalent compounds are because they completely ionize in water to create a solution filled with charged ions that can conduct an electric current.

The fact that the total amount of energy in a system remains constant is a(n)

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.