![]() Mercury-202 is composed of 80 protons, 122 neutrons, and 80 electrons. Mercury-201 is composed of 80 protons, 121 neutrons, and 80 electrons. Mercury-200 is composed of 80 protons, 120 neutrons, and 80 electrons. Mercury-199 is composed of 80 protons, 119 neutrons, and 80 electrons. Mercury-198 is composed of 80 protons, 118 neutrons, and 80 electrons. Mercury-196 is composed of 80 protons, 116 neutrons, and 80 electrons. ![]() 202Hg is the most common isotope, having a natural abundance of approximately 29%. Mass numbers of typical isotopes of Mercury are 198-202. Isotopes are nuclides that have the same atomic number and are therefore the same element, but differ in the number of neutrons. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z.įor stable elements, there is usually a variety of stable isotopes. Neutron number plus atomic number equals atomic mass number: N+Z=A. The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10 -19 coulombs. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Mercury is a chemical element with atomic number 80 which means there are 80 protons in its nucleus.
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