(ii) What are the ions present in these compounds?


Answer (ii) 

Periodic table Elements 1 to 20 - Teachoo.png

The two sodium atoms lose 1 electron each to form 2 sodium ions (2Na + ).

The oxygen atom forms an oxide ion (O 2- ) by gaining 2 electrons, one from each sodium atom. 

Na and O hence form an ionic compound Sodium Oxide (Na 2 O).

Reactions of metals to form oxides - Teachoo.png

(ii) The ions present in sodium oxide compound (Na 2 O) are : Sodium ions ( Na + ) and oxide ions.( O 2- )

Magnesium oxide (MgO) is formed of Mg 2+ and O 2- ions.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo