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The mass number is defined as the total number of protons and neutrons in an atom. The mass number = number of neutrons + atomic number.
Phosphorus (P) has an atomic mass of 15. Find out about its chemical and physical properties, states, energy, electrons, oxidation and more.
Element Phosphorus (P), Group 15, Atomic Number 15, p-block, Mass 30.974. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Phosphorus is the 15th element in the periodic table and has a symbol of P and atomic number of 15. It has an atomic weight of 30.97376 and a mass number of 31. Phosphorus has fifteen protons and sixteen neutrons in its nucleus, and fifteen electrons in three shells.
Learning Objectives. Calculate formula masses for covalent and ionic compounds. Define the amount unit mole and the related quantity Avogadro’s number. Explain the relation between mass, moles, and numbers of atoms or molecules, and perform calculations deriving these quantities from one another.
This formula indicates that there are three calcium ions (Ca 2+) for every two phosphate (PO 4 3−) groups. The PO 4 3− groups are discrete units, each consisting of one phosphorus atom and four oxygen atoms, and having an overall charge of 3−.
Phosphorus is a nonmetal, solid at room temperature, and a poor conductor of heat and electricity. Phosphorus occurs in at least 10 allotropic forms, the most common (and reactive) of which is so-called white (or yellow) phosphorus, which looks like a waxy solid or plastic.
