Some elements exist in several different structural forms, called allotropes. Each allotrope has birthday sex piano physical properties. For more information on the Visual Elements image see the Uses and properties section below.
The name is derived from the Greek ‘nitron’ and ‘genes’ meaning nitre forming. A vertical column in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell. A horizontal row in the periodic table.
The atomic number of each element increases by one, reading from left to right. Elements are organised into blocks by the orbital type in which the outer electrons are found. The number of protons in an atom. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. Density is the mass of a substance that would fill 1 cm3 at room temperature. The mass of an atom relative to that of carbon-12.