Lithium and potassium have similar chemical properties because the atoms of both elements have the same
(1) mass number
(2) atomic number
(3) number of electron shells
(4) number of valence electrons

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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