Question

valency of periodic table​

Answer 1

Answer:

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Answer 2

Answer:

The valency of an element is determined by the number of outer shell (valence) electrons. ... Group 6 elements, have 6 valence electrons and will tend to take 2 electrons and have a valency of -2. Group 7 elements have 7 valence electrons and will tend to take 1 electron and have a valency of -1.

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