Definition Of Terms Isotope

Since each atom of uranium has 92 protons the isotopes must have 142 143 and 146 neutrons respectively.

Definition of terms isotope. An atom is first identified and labeled according to the number of protons in its nucleus. Every chemical element has one or more isotopes. Isotopes are atoms of an element which have the same proton number but different nucleon numbers. More than one type of daughter isotope may result.

Hydrogen is the common example which has three isotopes these have the same atomic number one but different mass numbers 1 2 and 3. Uranium has three naturally occurring isotopes. The initial isotope is called the parent isotope while the atoms produced by the reaction are called daughter isotopes. In relation to securing dangerous material in case of crisis or terrorism a meaning of isotope may be outlined in general regarding european law as follows.

Different forms of an element or types of atom having the same number of protons in their nuclei but a different number of neutrons. As an example when u 238 decays into th 234 the uranium atom is the parent isotope while the thorium atom is the daughter isotope. Sodium 23 and sodium 24 are known as isotopes of sodium. There are 275 isotopes of the 81 stable elements in addition to over 800 radioactive isotopes and every element has known isotopic forms.

Isotope definition any of two or more forms of a chemical element having the same number of protons in the nucleus or the same atomic number but having different numbers of neutrons in the nucleus or different atomic weights.