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So paleomagnetism can really be thought of as the study of an ancient magnet field. Some of the strongest evidence in support of the theory of plate tectonics comes from studying the magnetic fields surrounding oceanic ridges.
Since a p subshell can hold 6 electrons, one of the fluorine electrons is unpaired. An unpaired electron acts like a little magnet. So fluorine, because of its unpaired electron, is weakly attracted into a magnetic field, and is said to be paramagnetic. All of calcium's electrons are in filled subshells.It has no unpaired elecectrons and is, therefore, not attracted to a magnetic field. It is said to be diamagnetic. This is vastly simplified, of course.ince a p subshell can hold 6 electrons, one of the fluorine electrons is unpaired. An unpaired electron acts like a little magnet. So fluorine, because of its unpaired electron, is weakly attracted into a magnetic field, and is said to be paramagnetic. All of calcium's electrons are in filled subshells.