Q44 of 400 Page 169

Why are ionic compounds usually hard?

the ionic compounds are made of oppositely charged ions so the force of attraction between is very high which is why the ionic compounds are usually hard.

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44 What is the number of outermost electrons in (i) a sodium atom, and (ii) an oxygen atom? 44 Show the formation of Na20 by the transfer of electrons between the combining atoms. 44 How is it that ionic compounds in the solid state do not conduct electricity but they do so when in molten state?’ 45 Write down the electron arrangement in (i) a magnesium atom, and (ii) a chlorine atom.