None.
A gram is a measure of mass. ppm is a measure of concentration or the ratio of two masses (or even two volumes). The two measure different things and, according to elementary rules of dimensional analysis, comparing one with the other is not valid.
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Yes, micrograms per gram is the same as ppm. Ppm means parts per million. There are a million micrograms in a gram.
The two are unrelated. ppm means "parts per million", so the amount of grams for 1 ppm will also depend on the size of the sample. For example, if you have a sample of one ton, 1 ppm (a millionth of it) would be 1 gram; if your sample has a mass of one kilogram, 1 ppm would be 1 milligram, etc.
This question doesn't make sense. This is because the term parts per million means either weight per weight i.e. micrograms per gram or milligrams per kilograms, or weight per volume, i.e. milligrams per litre or micrograms per millilitre.
Oh, converting parts per million to grams per ton is like painting a happy little tree. You see, first, you need to know the density of the substance in the ton. Then, you can use this formula: grams per ton = (ppm * tons) / 1 million. Just a few gentle brushstrokes of math, and you'll have your answer, creating a beautiful harmony between the two units.
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