How many electrons does one atom of calcium donate to one atom of oxygen during the formation of the compound cao?

Explanation:

Atomic number of calcium is 20 and its electronic configuration is 2, 8, 8, 2. So, to acquire stability it loses 2 valence electrons and hence forms ion.

Whereas atomic number of oxygen is 8 and its electronic distribution is 2, 6. And, to attain stability its needs to gain two more electrons and hence then it forms ion.

Therefore, when both calcium and oxygen chemically combine together then calcium atom will donate its 2 valence electrons to the oxygen atom.

Hence, they will form calcium oxide, that is, CaO.

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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