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प्रश्न
An atom of an element is denoted by a “symbol” Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Helium by ‘He’
उत्तर
Symbols: The short form or abbreviated name of the element (or radicals) The reason for representing the following element by their symbol is as follow:
Helium by He – First two letters of the name of Noble gases.
संबंधित प्रश्न
The atoms of which of the following pair of elements are most likely to exist in free state ?
An element which can exhibit valencies of 2, 4 and 6 can be :
Give two examples of the following:
Solid + Liquid mixture
Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.
Ca2+ NO31-
In the chemical word equation – Zinc + Sulphuric acid → Zinc sulphate + Hydrogen
The molecular equation is :
Zn + H2SO4 → ZnSO4 + H2[g].
State what [g] represents.
Give the symbol of the following element:
Zinc
Write the radical of the following valency:
Bromine [Bromide]
Write the chemical formula of the following:
magnesium sulphate
Give the formula of the following acid:
Sulphuric
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Bisulphite
