• The elements are the chemically discrete types of atom which make up the universe and of which chemical compounds are composed. Atoms of a particular element can vary in the number of neutrons in their nucleus, with the variants being called isotopes, but must always have the same number of positively-charged protons, and an equivalent number of electrons in orbit around the nucleus. The simplest example is the three isotopes of hydrogen, normal hydrogen, deuterium and tritium, which have no neutrons, one neutron and two neutrons respectively. Each has one proton, with one electron in orbit around the nucleus.
  • A fundamental, distinct, and usually irreducible constituent of a given entity, process, or concept. For example, any of the various functional parts of an electron tube.
  • Any of the electrical components that are a part of a circuit. These may include resistors, capacitors, transistors, generators, electron tubes, and so on. Each element has terminals which allow it to be connected to the conducting path. Also called electrical element, circuit element, circuit component, or component (2).
  • A substance which can not be subdivided into smaller units by chemical means. There are over 110 known chemical elements, each with unique properties, and they comprise all matter above the atomic level. The smallest particle that retains all the properties of an element is an atom. All neutral atoms of a given chemical element have the same number of protons and electrons, and if an element has isotopes, the difference between each is the number of neutrons in its nucleus. Also called chemical element.
  • Within an antenna array, one of multiple radiators which contribute to its overall transmission and/or reception characteristics. Such an element may be driven, or parasitic. Also called antenna element.
  • In computers, the smallest subunit within a larger set For instance, picture elements or data elements.

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