Make sure you are not blank an H2S source

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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i think its 5049.

i hope this !

it is stable as it is in group 0 which have full outer shells of electrons