![]() ![]() ![]() Therefore, the number of electrons in neutral atom of Magnesium is 12. The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. Magnesium-26 is composed of 12 protons, 12 neutrons, and 12 electrons. Magnesium-25 is composed of 12 protons, 13 neutrons, and 12 electrons. Magnesium-24 is composed of 12 protons, 12 neutrons, and 12 electrons. The lighter isotopes mostly decay to isotopes of sodium while the heavier isotopes decay to isotopes of aluminium. The longest-lived radioisotope is 28Mg with a half-life of 20.915 hours. Magnesium naturally occurs in three stable isotopes, 24Mg, 25Mg, and 26Mg. Mass numbers of typical isotopes of Magnesium are 24 25 26. ![]() 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. Magnesium is a chemical element with atomic number 12 which means there are 12 protons in its nucleus. ![]()
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