When element 20A combines with element 8Y,

an ionic compound, A2Y is formed

a covalent compound, AY2 is formed

WAEC SSCE - Chemistry - 2011 (Objective)

Question 1 Report

An element with the electron configuration of 1s ²2s ²2p ⁶ would have a combining power of

Answer Details

The electron configuration 1s²2s²2p⁶ belongs to the noble gas neon (Ne). Elements in the noble gas family have a full outer shell of electrons, which makes them stable and unreactive. Combining power, also known as valency, is a measure of how many chemical bonds an element can form with other atoms. Noble gases have a combining power of 0 because they already have a full outer shell of electrons and do not need to gain or lose any electrons to achieve stability. Therefore, the answer is 0.

Read lesson note on Structure Of The Atom (Ghana Only) (WAEC)






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