(a) (i) Write two properties of gold which make it the most suitable metal for ornaments.(ii) Name two metals which are the best conductors of heat.(iii) Name two metals which melt when you keep them on your palm.(b) Explain the formation of ionic compound CaO with electron-dot structure. Atomic numbers of calcium and oxygen are 20 and 8 respectively.

(a) (i) The property of malleability and ductility of gold makes it suitable for making ornaments.
(ii) Silver and Copper are the best conductors of heat.

(iii) Gallium and cesium are the metals that melt when kept on palm.
 (b) Calcium reacts with oxygen to form an ionic compound calcium oxide (CaO). The atomic number of calcium is 20 and that of oxygen is 8 . By losing two electrons ,the calcium atom forms a calcium ion( Ca²⁺ ) ,and by gaining two electrons ,the oxygen atom forms an oxide ion (O^2-).

The electron dot structure is given below:

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Updated on: 10-Oct-2022

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