chemical element
SPECIES OF ATOMS HAVING THE SAME NUMBER OF PROTONS IN THE ATOMIC NUCLEUS AND THE SAME CHEMICAL PROPERTIES, BUT NOT NESSARILY THE SAME MASS, OR THE SAME STABILITY (OR HALF-LIFETIME IF THEY ARE UNSTABLE)
Elemental substance; Chemical Elements; Pure element; Chemical elements; Chemical Element; Element (chemistry); Molecular and atomic elements; Chemical element name; Nutritional chemical elements; Physical Elements; History of chemical elements; Light element; Naturally occurring element; Elementary substance
химический элемент