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What is valency? Explain the trends of valency for elements in a period and in a group. |
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Answer» Solution :Relative ability of an element to combine with other element is known as a valency. OR The valency is the combining capacity of an atom of an element to acquire noble GAS configuration. Valency depends on the number of valence electrons. The valency of an element is either equal to the number of electrons in the valence shell or equal to eight minus the number of electrons in the valence shell or equal to 18 minus the group number of the element in the modern periodic table. Variation of valency in a period : On moving from left to right in a period, the valency of the elements first increases and then decreases. For example, the valency of elements of the THIRD period are as follows:  Variation of valency in a group: In the modern periodic table, the elements of the same group have the same outer electronic configuration. Hence, all the elements of the same group POSSESS equal number of valence electrons. Therefore, valency of each element remain same. For exampl. 
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