Question 7. Define valency by taking examples of silicon and oxygen.
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Valanci of oxygen is 2 or -1
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Explanation: The valency may be defined as the combining capacity of the atoms of elements, or their tendency to form molecules with atoms of the same or different elements. The electrons in an atom are arranged in different shells/orbits. The electrons present in the outermost shell of an atom are known as the valence electrons.
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