Which of the following elements has the largest atomic size? S, Ba, Po, Ca

neutrons are in the middle of the atom and the electrons, which are much smaller.

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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