Question

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

Answer 1

Calcium donates 2 electrons to Oxygen

Answer 2

Step-by-step 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
`Ca^(2+)` 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
`O^(2-)` 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.