How do we calculate valency???

1.	How do we calculate valency???
Answer» If the number of electrons in the outer shell is between 1 to 4 the compound is said to have positive valency. For compound with electrons 4,5,6, or 7 the valency is determined by subtracting the electrons from eight U can use electronic configuration Like in oxygen 2,6 which add up to 8 which is its atomic no. The general e.c. should be following 2,8,8 like that So it\'s missing two electronsSo it will be -2

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