Description : What is the valence electron of phosphorus ?
Last Answer : Phosphorus valence electron 5 .
Description : What element has the same valence electron configuration as phosphorus?
Last Answer : The answer is nitrogen. Nitrogen is one example of an elementthat has the same valence electron configuration asphosphorus.Ê
Description : Difference between Valency and Valence electrons ? -Chemistry
Last Answer : 1 ) Valency : The ability to gain, loose and sharing of electrons is valency / combinig capacity atoms of other elements is valency. 2 ) Valence elctrons : Electrons present in the outermost shell of the atom is valence electrons.
Description : What is the valence of titanium ?
Last Answer : Titanium valence 3 and 4 .
Description : What is the valence of calcium ?
Last Answer : Calcium valence 2 .
Description : What is the valence of potassium ?
Last Answer : Potassium valence 1 .
Description : What is the valence of chlorine ?
Last Answer : Chlorine valence 1, 3, 5, 7 .
Description : What is the valence of aluminum ?
Last Answer : Aluminum valence 3 .
Description : What is the valence of magnesium ?
Last Answer : Magnesium valence 2 .
Description : What is the valence of helium ?
Last Answer : Helium has zero viscosity.
Description : What is the valence electron of fluorine ?
Last Answer : The valence of fluorine is seven.
Description : (2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that ... to free electrons. This means mobility is also less for a hole compared to free electron.
Last Answer : Carbon dioxide is called a greenhouse gas because - (1) its concentration remains always higher than other gases (2) it is used in photosynthesis (3) it absorbs infrared radiation (4) it emits visible radiation
Description : Atoms of different elements have - (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configuration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons
Last Answer : (3) different atomic number and different number of valence electrons Explanation: Each element's atoms have a different number of protons, neutrons, and electrons, which is why they have different ... Their reactivity also varies because of the number and activeness of the electrons in the atom.
Description : Electrons in the highest energy level of an atom are called _______. (1) valence protons (2) orbital protons (3) valence electrons (4) orbital electrons
Last Answer : (3) valence electrons Explanation: The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
Description : Indicate three differences between valence and oxidation number?
Last Answer : Ans (i) Valency of an element cannot not be zero but oxidation number can be. (ii) Valency is just a number but oxidation number can be negative or positive. (iii) Valency is the combining capacity whereas oxidation number refers to charge which an atom carry when present in the combined state.
Description : Explain the formation of H2 molecule on the basis of valence bond theory.
Last Answer : Ans. When two H atoms come closer the following forces operate between them: a. Attractive : i.nucleus of atom and its electron ii.nucleus of one atom and electron of other. b.repulsive ... and the system acquires minimum energy .At this stage two hydrogen atoms are said to be bonded together.
Description : From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. ( ... . (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.
Last Answer : Ans. (a). The element chlorine (Cl) has the highest negative electron gain enthalpy. (b). The element cesium (Cs) has lowest ionization enthalpy. (c). The element fluorine F has lowest atomic radius. (d ... zero group (or group 18). (g). The element carbon (C) forms the largest number of compounds.
Description : Which one of the following elements has valence electrons in the n = 3 shell? A beryllium B oxygen C silicon D neon E hydrogen
Last Answer : C silicon
Description : How many electrons are there in the valence shell of the O2– ion? A 2 B 8 C 10 D 16 E 18
Last Answer : B 8
Description : Oxygen has a valence number of -1 in: w) Sodium Peroxide x) Potassium Chlorate y) Water z) Sodium Hydroxide
Last Answer : ANSWER: W -- SODIUM PEROXIDE
Description : How many electrons are there in the valence shell of a calcium atom?
Last Answer : ANSWER: 2
Description : How many valence electrons does an atom of an element with an atomic number of twelve have?
Last Answer : ANSWER: TWO
Description : Atoms of different elements have (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configu-ration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons
Last Answer : different atomic number and different number of valence electrons
Description : (a) Define a balanced chemical equation. Why should an equation be balanced? (b) Write the balanced chemical equation for the following reaction: (i) Phosphorus burns in presence of chlorine to form phosphorus penta chloride. (ii) Burning of natural gas. (iii) The process of respiration. -Chemistry
Last Answer : Answer. (a) Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. According to law of conservation of mass, matter can neither be created nor be destroyed in a chemical ... C6H12O6 (s) + 6O2 (g) + 6H2O ---> 6CO2 (aq) + 12H2O (l) + energy
Description : What is the physical condition of phosphorus ?
Last Answer : Physical condition of phosphorus is a sticky metal.
Description : Who Discovered Phosphorus ?
Last Answer : Phosphorus H. Brandt discovers.
Description : In what year was phosphorus discovered ?
Last Answer : Phosphorus was discovered in 1669 cell.
Description : What is the boiling point of phosphorus ?
Last Answer : Phosphorus boiling point is 280 degrees Celsius.
Description : What is the melting point of phosphorus ?
Last Answer : The melting point of phosphorus is 44 degrees Celsius.
Description : What is the relative atomic mass of phosphorus ?
Last Answer : The relative atomic mass of phosphorus is 30 .
Description : Where did phosphorus come from ?
Last Answer : : Phosphorus comes from the Greek word phosphorus, which means luminous.
Description : What is the atomic number of phosphorus ?
Last Answer : The atomic number of phosphorus is 15 .
Description : What is produced when phosphorus pentachloride is heated ?
Last Answer : When phosphorus pentachloride is heated, phosphorus trichloride and chlorine are produced.
Description : Position of Phosphorus in Periodic Table v , What is the reason ?
Last Answer : The position of phosphorus is in class V in the periodic table , because- i) the atomic number of phosphorus is divisible by 15 or 5 ii) the last layer of phosphorus atom has 5 electrons
Description : What is Phosphorus ?
Last Answer : This is an element.
Description : What is the mass of phosphorus ?
Last Answer : : The mass of phosphorus is 30.984.
Description : (3) They are not easily combustible Explanation: Typical organic compounds are combustible by nature as they contain carbon. Organic compounds mostly consist of carbon, hydrogen, halogen, and phosphorus.
Last Answer : Which of the process is known as nitrification? (1) Reaction of Nitrogen Monoxide with oxygen to form nitric acid (2) Reaction of nitrogen dioxide with water to form nitric acid (3) Conversion of ammonia to nitrites (4) Conversion of nitrite to nitric oxide
Description : Phosphorus is kept in water because – (1) its ignition temperature is very high (2) its ignition temperature is very low (3) its critical temperature is high (4) its critical temperature is low
Last Answer : (2) its ignition temperature is very low Explanation: The allotropic form of Phosphorus (white phosphorus) is less stable and therefore highly reactive because of angular strain in P4 molecule where the angles are only 600.
Description : Acid rain is caused due to pollution of atmosphere by – (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorus (4) None of these
Last Answer : (2) oxides of nitrogen and sulphur Explanation: Acid rain is caused by emissions of Sulpfur Dioxide (SO2) and Nitrogen Oxide (NOx), which react with the water molecules in the atmosphere to produce acids.
Description : Which of the following is an essential element used in the synthesis of proteins and other compounds? (1) Phosphorus (2) Iron (3) Magnesium (4) Nitrogen
Last Answer : (4) Nitrogen Explanation: Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
Description : Match sticks are made of - (1) Red phosphorus (2) blue phosphorus (3) led nitrate (4) None
Last Answer : (1) Red phosphorus Explanation: Red phosphorus is used in matches. Ferrophosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel.
Description : Which of the following is Colourless? (1) Chlorine (2) Oxygen (3) Phosphorus (4) Sulphur
Last Answer : (2) Oxygen
Description : White phosphorus is generally kept under – (1) Alcohol (2) Water (3) Glycerine (4) Kerosene oil
Last Answer : (2) Water Explanation: White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
Description : The element used for vulcanizing rubber is - (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus
Last Answer : (1) Sulphur Explanation: The vulcanization of neoprene or polychloroprene rubber (CR rubber) is carried out using metal oxides (specifically MgO and ZnO, sometimes Pb3O4) rather than sulfur compounds which are presently used with many natural and synthetic rubbers.
Description : Bone deformities occur due to excessive intake of: (1) Phosphorus (2) Potassium (3) Fatty acid (4) Fluorine
Last Answer : (4) Fluorine Explanation: Bone deformities occur due to excessive intake of Fluorine.
Description : The element absorbed both in cation and anion form is – (1) Sulphur (2) Nitrogen (3) Calcium (4) Phosphorus
Last Answer : (2) Nitrogen Explanation: Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
Description : Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorus (3) Potassium (4) Silicon
Last Answer : (4) Silicon Explanation: Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
Description : Which of the following elements has the atomic number greater than that of Phosphorus? (1) Aluminium (2) Silicon (3) Chlorine (4) Magnesium
Last Answer : (3) Chlorine Explanation: Chlorine is a chemical element with symbol Cl and atomic number 17. Phosphorus is a chemical element with symbol P and atomic number 15.
Description : Which one of the following forms of phosphorus is most reactive? (1) Black phosphorus (2) White phosphorus (3) Violet phosphorus (4) Red phosphorus
Last Answer : (2) White phosphorus Explanation: White phosphorus is the most reactive form of phosphorus. It is made up of discrete P4 tetrahedra which are subjected to very high angular strain as the angles ... reactive. It ignites spontaneously at about 50°C, and at much lower temperatures if finely divided.