Another name for the representative elements is the "A elements." These elements are found within the first two families and last six families of the Periodic Table.Continue Reading
The representative elements are found in Groups I and II, which are on the left side of the Periodic Table, and Groups III through VIII on the right side of the table. These elements include the alkali metal group, alkaline earth metals and chalcogens.
The elements in each group share the same characteristics. For example, alkali metals are soluble in water and easily cut with a knife. Alkaline earth metals are harder than alkali metals, and they are not as reactive with oxygen.Learn more about Atoms & Molecules
The periodic table can be filled by tabulating elements in order of increasing atomic number. This method was first devised by Russian chemist Dmitri Ivanovitch Mendeleev in 1869 and has been used in physical and chemical science since.Full Answer >
Out of 115 named elements on Earth, 92 classify as natural elements. These elements exclude substances deriving from chemical bases, which do not break down into simpler molecules. The family of natural elements starts with hydrogen and proceeds down the period table of elements to uranium.Full Answer >
An atom of chromium with no charge has a total of 24 electrons, as indicated by the element's atomic number on the periodic table of elements. The atom also holds 24 protons and 28 neutrons.Full Answer >
Aluminum belongs to the boron family of elements. The boron family, known as Group 13, also includes boron, gallium, indium and thallium. All Group 13 elements have three electrons in their outermost energy levels.Full Answer >