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We know that the ~ is used before a number to say it's approximate.
But in the case of people reached, the uncertainty comes when 1000 people is passed (after it all numbers has a k to denote kilo or thousand).
Why is the ~ sign used even when the number is exact and three-digits.
One of the questions in my homework was to draw HSO3-, which I thought to be pretty easy. Sulfer is the least electronegative (except Hydrogen but it can't be the central atom), hence it is the Central atom. Then I drew out the structure with the hydrogen single bonded, 2 oxygen double bonded and...
