Ernest Rutherford , a British physicist, performed an experiment that strongly suggested that the positive charge of an atom located in a very small nucleus. Rutherforth's experiment made use of polonium, a radioactive element that gives of positvely charged particles. These parti

Isotopes are atoms of a given element that have the same number of protons but a diferent number of neutrons.Isotopes of an element are chemically identical to each other.Theb different number of neutrons produce a different mass in each isotope. Mass is the sum of the number of protons and the number of nuetrons. Gram-atomic mass of an element is the mass of the element expressed in grams.

Some common words found in the essay are:
Ernest Ruthefold, Rutherford British, , alpha particles, mass element, nucleus atom, atomic mass unit, charge atom, metal foil, empty space, mass unit, positive charge, atomic mass,
Approximate Word count = 514
Approximate Pages = 2 (250 words per page double spaced)