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प्रश्न
Explain the terms 'valency' and 'variable valency'.
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उत्तर
Valency: The number of electrons that an atom can lose, gain or share during a chemical reaction is called its valency.
Variable valency: Certain elements exhibit more than one valency, i.e. they show variable valency.
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संबंधित प्रश्न
Name the elements represented by the following symbols :
Hg, Pb, Au, Ag, Sn
Give a reason why elements are tabulated in a table called the ‘Periodic table’.
Explain the terms ‘chemical formula’.
Match the symbols of metallic elements – with their correct combining power or capacity.
(a) K
(b) Zn
(c) Al
(d) Na
(e) Ca
Combining power or capacity – A : 3 ; B : 2 ; C : 1. (positive valencies)
Elements are mainly classified into metals and non-metals. State six properties of metals which differ from non-metals.
Give the symbol of the following element:
Neon
Give the symbol of the following element:
Lead
Give the symbol of the following element:
Iodine
Write the radical of the following valency:
Iodine
Name three metals whose symbols are derived: from their Latin names.
