In the universe, neutrons are abundant, making up more than half of all visible matter. 121Sb is the most common isotope, having a natural abundance of approximately 57%.Īntimony-121 is composed of 51 protons, 70 neutrons, and 51 electrons.Īntimony-123 is composed of 51 protons, 72 neutrons, and 51 electrons.Ī neutron is one of the subatomic particles that make up matter. Main Isotopes of AntimonyĪntimony occurs in 2 natural isotopes: 121Sb and 123Sb. Mass numbers of typical isotopes of Antimony are 121, 123. 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. Antimony is a chemical element with atomic number 51 which means there are 51 protons in its nucleus.

Antimony noble gas configuration