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The only nonradioactive isotope of fluorine has 9 protons and 10 neutrons. a. What is its mass number. b. Write the full symbol of this atom.
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why ionisation energy of aluminium is greater then Ga?
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Q. Show the Extraction of Oxygen? Oxygen is separated from air on a large scale by the fractional distillation of liquid air. It is obtained as a by-product along with hydrogen
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Q. Concepts of valence bond theory? The developments can also be cited as a typical example of the manner in which scientific theories grow and are refined in any particular fi
What is Tube extrusion Billet is placed inside a container between die and mandel. Mandel is pressed by ram and metal is extruded through the die. This process is used for m
The mole is a unit of dimension or measurement used in chemistry theory to calculate amounts of a chemical substance, defined as an amount of a substance which contains as many elementary entities (e.g., atoms, molecules, electrons, ions) as there are atoms in 12 grams of pure carbon-12 (12C), the isotope of carbon with atomic weight 12. This corresponds to a value of 6.02214179(30)×1023 elementary entities of the substance. This is one of the base units in the International System of Units ISU, and has the unit symbol mol.
The mole is broadly used in chemistry, in its place of units of mass or volume, as a convenient way to express the amounts of reactants & products of chemical reactions.
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