Etiquette in retail is sometimes summarized as The customer is always right.. There are always two sides to the case, of course, and it is a credit to good manners that there is scarcely ever any friction in stores and shops of the first class.
Part of the Computing fundamentals glossary: An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element. The nuclei of most atom s contain neutrons as well as protons.
An element is a substance consisting of atoms which all have the same number of protons - i.e. the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical methods. Elements can only be changed into other elements using nuclear methods. Although an elementâs atoms must all have the same number of protons, they can have different numbers of neutrons and hence different masses. When atoms of the same element have different numbers of neutrons, they are called isotopes. The Most Abundant Elements