An atom in the ground state contains three electrons in its outermost principal energy level. This is an atom of an element found in Group A) 1 B) 5 C) 13 D) 3

5

Explanation: it’s on the reference table

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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