3; When counting significant figures, all nonzero numbers are significant, and any zero that is behind a decimal point is also significant.
<span>Specific gravity is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.</span>
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Hybridization is the concept of mixing atomic orbitals to form new hybrid orbitals (with different energies, shapes, etc., than the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory.
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Explanation: i think it is C if i'am wrong i'am sorry
