a) write the no. of valence electrons in 1) Na atom and Na+ ions , (2) O atom and O-2 ion . (B) an element ' E ' loses 2e to form E+2 ion .what will be the chemical formula of the compound formed between E and oxygen .

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Solution

Dear student

a. The valence electron is an outer shell electron that can participate in the formation of a chemical bond.

Na = 2 8 1, valence electron is 1.
Na⁺ = 2 8. valence electron is 8.
O = 2 6. valence electron is 6.
O²^- = 2 8, valence electron is 8.

B.The element E can be Mg, Ca etc because of these metals show +2 oxidation state. They form the metal oxide with oxygen like MgO, CaO etc.

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