It cannot be obtained free from water. Phosphorus is a vital plant nutrient and its main use – via phosphate compounds – is in the production of fertilizers. A molecule of Phosphorus consists of four atoms of Phosphorus, and hence it is tetra- atomic. Sulphur is poly-atomic. Phosphorus is used in the manufacture of safety matches (red phosphorus… These elements are called monoatomic. The number of atoms constituting a molecule is known as its atomicity. Give a reason why – (a) Helium is considered monoatomic, but hydrogen a diatomic molecule. Black phosphorus is the thermodynamically stable form of phosphorus at room temperature and pressure, with a heat of formation of -39.3 kJ/mol (relative to white phosphorus which is defined as the standard state). Textbook Solutions 8950. Customize assignments and download PDF’s. False. Assertion : the air is a mixture . The atomicity of phosphorus is 4 . Best answer. Atomic mass of Phosphorus is 30.9738 u. The atomicity of nitrogen and phosphorus is respectively (A) 2 and 2 (B) 2 and 3 (C) 2 and 4 (D) 2 and 5. Concept Notes & Videos 287. Phosphorus have atomicity of four as it is tetravalent. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Just as there are biological carbon and nitrogen cycles, there is also a phosphorus cycle. New questions in Chemistry. Atomic Number of Phosphorus. The chemical symbol for Phosphorus is P.. Atomic Mass of Phosphorus. (b) Ozone is considered triatomic, but phosphorus a tetratomic molecule. Reason : it shows Tyndall effect and brownian movement *1 pointA) both assertion and reasons are correct and reason … Advertisement Remove all ads. Answer 6: Atomicity —Atomicity is the number of atoms that make a molecule of an element. Syllabus. When phosphorus is gradually added to nitric acid, phosphoric acid is generated and remains mingled with the residual nitric acid. ... Classify each of the following on the basis of their atomicity: Ag. The atomicity of H e is : View solution. Phosphorus molecule. View solution. The number of atoms of constituting a molecule is known as its atomicity. Atomicity of phosphorus is 5 and that of sulphur is 6. atoms and molecules; class-9; Share It On Facebook Twitter Email. Atomicity is the total number of atoms present in one molecule of an element or a substance. So the atomicity of phosphorus is 4. View more. Brainly User Brainly User Atomicity is the number of atoms in the molecules of an element . View solution. View solution. Explain the term – ‘atomicity’. what is the atomicity of phosphorus and how to calculate the relative mass of compound - Science - Atoms and Molecules 1 Answer +1 vote . answered Oct 15, 2020 by Saadhvi (54.5k points) selected Oct 15, 2020 by Aakshya . Atomicity of water is 3.because molecular formula of water is H2O.atoms in hydrogen is 2 and oxygen is 1 and by adding we get 3 because atomicity is defined as the number of … The Atomicities of Ozone, Sulphur, Phosphorus and Argon Are Respectively : CBSE CBSE Class 9. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from … Create custom Assignments. It was first synthesized by heating white phosphorus under high pressures (12,000 atmospheres) in 1914. Question Bank Solutions 8008. Molecules of many elements, such as argon (Ar), helium (He), etc., are made up of only one atom of that element. Important Solutions 1. Physical Properties of Phosphoric Acid (H 3 PO 4) Phosphoric acid is an odourless, colourless, viscous liquid, possessing in a high degree the property of reddening litmus. 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