![]() It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg-marginally greater than that of the proton but nearly 1839 times greater than that of the electron. In the universe, neutrons are abundant, making up more than half of all visible matter. ![]() Iodine-129 is composed of 53 protons, 76 neutrons, and 53 electrons.Ī neutron is one of the subatomic particles that make up matter. Iodine-127 is composed of 53 protons, 74 neutrons, and 53 electrons. 127I is the most common isotope, having a natural abundance of approximately 100%. 129I is very slightly radioactive, decaying by beta decay with a half-life of 1.57×10 7 years and occurs only in traces. Iodine occurs in 2 natural isotopes: 127I and 129I. Mass numbers of typical isotopes of Iodine are 127. 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. Iodine is a chemical element with atomic number 53 which means there are 53 protons in its nucleus.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |