Periodic Classification of Elements

_______periodic table had some discrepancies, which were difficult to overcome.
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Mendeleev’s
Hendry Moseley, a British scientist in 1912, discovered a new property of elements called ____
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Atomic number
The physical and chemical properties of the ____ are the periodic functions of their atomic numbers
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Elements
The horizontal rows are called ____
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Periods
There are _____ periods in the periodic table.
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Seven
_____is the shortest period. It contains only two elements (Hydrogen and Helium).
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First period
Second period contains ____ elements
Third period contains ____ elements
Fourth period contains ____ elements
Fifth period contains ____ elements
Sixth period contains _____ elements
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32 elements
Seventh period contains _____ elements
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32 elements
The vertical columns in the periodic table starting from top to bottom are called
_______
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Groups
There are ____ groups in the periodic table.
The Lanthanides and Actinides, which form part of Group 3 are called ____
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Inner transition elements
Except ______ all the elements present in each group have the same number of electrons in their valence shell and thus have the same valency
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Group 18
Anything which repeats itself after a regular interval is called _____
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Periodic
Properties such as atomic radius, ionic radius, ionisation energy, electronegativity, electron affinity, show a regular periodicity and hence they are called _______
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Periodic properties
______ of an atom is defined as the distance between the centre of its nucleus
and the outermost shell containing the valence electron
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Atomic radius
Atomic radius in metal atoms is known as _____
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Metallic radius
In non-metallic elements, their atomic radius is known as ______
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Covalent radius
_________ 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
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Ionic Radii
When a neutral atom loses an electron, it becomes a positively
charged ion called_____
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Cation
The gain of an electron by a neutral atom forms a negatively
charged ion called_____
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Anion
_________ is the minimum energy required to remove an electron from
an isolated gaseous atom in its ground state to form a cation
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Lonisation energy
Ionisation energy otherwise called ______ ionisation
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Enthalpy
_______energy decreases down the group in the periodic table.
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Ionisation
________ is a science of extracting metals from their ores and modifying the
metals into alloys for various use
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Metallurgy
______is the process of removal of impuries from the ore.
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Concentration or Separation of the ore
______ is the convertion of the ore into metal.
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Production of the metal
____is the process of purification of the metal.
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Refining of the metal
A ____ may be a single compound or a complex mixture of various
compounds of metals found in the Earth
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Mineral
The mineral from which a metal can be readily and economically extracted on a
large scale is said to be an ___
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Ore
The process of extracting the ores from the Earth’s crust is called ____
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Mining
The rocky impurity associated with an ore is called ____
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Gangue or matrix
___is the substance added to the ore to reduce the fusion temperature and to
remove the impurities
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Flux
____ is the fusible product formed when a flux reacts with a gangue during the
extraction of metals.
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Slag
______ is the process of reducing the roasted metallic oxide from the
metal in its molten condition
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Smelting
All metals are solids at room temperature except ____
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Mercury and gallium
____ are good conductors of heat and electricity
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Metals
The molten matte is transferred to Bessemer converter in order to
obtain___
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Blister copper
____is used in making pipes, stoves, radiators, railings, manhole covers and drain pipes
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Pig iron
____ is used in the construction of buildings, machinery, transmission cables and T.V towers and in
making alloy
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Steel
_____is used in making springs, anchors and electromagnets.
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Wrought iron
_____ is a homogeneous mixture of two or more metals or of one or more metals with
certain non-metallic elements.
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Alloy
_____ is an alloy of mercury with another metal
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Amalgam
_____is the gradual destruction of metals by chemical or electrochemical reaction with
the environment.
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Corrosion
The metals can be ____ to prevent from the process of corrosion. E.g: Stainless Steel
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Alloyed
_____ is the process of coating zinc on iron sheets by using electric current
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Galvanization
_____is a method of coating one metal over another metal by passing
electric current
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Electroplating
____ is widely used for anodizing process.
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Aluminium
____ is the method of controlling corrosion of a metal surface protected is coated with the metal which is easily corrodible.
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Cathodic Protection