Element

http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C1940

A basic part of a whole. In chemistry, refers to a simple substance that cannot be broken down into smaller parts or changed into another substance. The basic part of an element is an atom, which contains protons, neutrons, and electrons. All atoms of an element have the same number of protons. Examples of elements are hydrogen, carbon, oxygen, nitrogen, and calcium.

CHEBI:33259

C1940

A substance whose atoms all have the same atomic number, that cannot be divided into simpler substances, and that singly or in combination constitute all matter.

Element

Element_or_Isotope

Element

C1940

Element

Element, Ion, or Isotope

C0013879

http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C579