Periodic Classification of Elements

_______periodic table had some discrepancies, which were difficult to overcome.     Hendry Moseley, a British scientist in 1912, discovered a new property of elements called ____   The physical and chemical properties of the ____ are the periodic functions of their atomic numbers   The horizontal rows are called ____   There are _____ periods in the periodic table.   _____is the shortest period. It contains only two elements (Hydrogen and Helium).   Second period contains ____ elements   Third period contains ____ elements   Fourth period contains ____ elements   Fifth period contains ____ elements   Sixth period contains _____ elements   Seventh period contains _____ elements   The vertical columns in the periodic table starting from top to bottom are called  _______   There are ____ groups in the periodic table.   The Lanthanides and Actinides, which form part of Group 3 are called ____   Except ______ all the elements present in each group have the same number of electrons in their valence shell and thus have the same valency   Anything which repeats itself after a regular interval is called  _____   Properties such as atomic radius, ionic radius, ionisation energy, electronegativity, electron affinity, show a regular periodicity and hence they are called _______   ______ of an atom is defined as the distance between the centre of its nucleus  and the outermost shell containing the valence electron   Atomic radius in metal atoms is known as _____   In non-metallic elements, their atomic radius is known as ______   _________ is defined as the distance from the centre of the nucleus of the ion upto the point where  it exerts its influence on the electron cloud of the ion   When a neutral atom loses an electron, it becomes a positively  charged ion called_____   The gain of an electron by a neutral atom forms a negatively  charged ion called_____
  _________ is the minimum energy required to remove an electron from  an isolated gaseous atom in its ground state to form a cation    Ionisation energy otherwise called ______ ionisation    _______energy decreases down the group in the periodic table.    ________ is a science of extracting metals from their ores and modifying the  metals into alloys for various use   ______is the process of removal of impuries from the ore.   ______ is the convertion of the ore into metal.   ____is the process of purification of the metal.   A ____ may be a single compound or a complex mixture of various  compounds of metals found in the Earth   The mineral from which a metal can be readily and economically extracted on a  large scale is said to be an ___   The process of extracting the ores from the Earth’s crust is called ____   The rocky impurity associated with an ore is called ____   ___is the substance added to the ore to reduce the fusion temperature and to  remove the impurities   ____ is the fusible product formed when a flux reacts with a gangue during the  extraction of metals.   ______ is the process of reducing the roasted metallic oxide from the  metal in its molten condition   All metals are solids at room temperature except ____   ____ are good conductors of heat and electricity   The molten matte is transferred to Bessemer converter in order to  obtain___ 
  ____is used in making pipes, stoves, radiators, railings, manhole covers and drain pipes   ____ is used in the construction of buildings, machinery, transmission cables and T.V towers and in  making alloy   _____is used in making springs, anchors and electromagnets.     _____ is a homogeneous mixture of two or more metals or of one or more metals with  certain non-metallic elements.    _____ is an alloy of mercury with another metal   _____is the gradual destruction of metals by chemical or electrochemical reaction with  the environment.    The metals can be ____ to prevent from the process of corrosion. E.g: Stainless Steel   _____ is the process of coating zinc on iron sheets by using electric current   _____is a method of coating one metal over another metal by passing  electric current   ____ is widely used for anodizing process.   ____ is the method of controlling corrosion of a metal surface protected is coated with the metal which is easily corrodible.