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(a). Write down the electron arrangement...

(a). Write down the electron arrangement in (i) a magnesium atom, and (ii) a chlorine atom.
(b). How many electrons are there in the valence shell of (i) a magnesium atom, and (ii) a chlorine atom?
(c). Show the formation of magnesium chloride from magnesium and chlorine by the transfer of electrons.
(d) State whether magnesium chloride will conduct electricity or not. give reason for your answer.
(e). Why are covalent compounds generally poor conductors of electricity?

Text Solution

Verified by Experts

Mg - 12 2, 8, 2
Cl - 17 2, 8, 7

The 2 electrons lost by a magnesium atom are gained by chlorine atoms to produce a magnesium ion and 2 chloride ions.
`MgCl_(2)`
Solution of magnesium chloride conducts electricity because an ionic compound dissociates into ions when dissolved in water and hence conduct electricity.
For example : zinc sulphide should be roasted to obtain zinc oxide.
`2ZnS + 3O_(2) rarr2ZnO + 2SO_(2)`
After any of the above steps, zinc should be reduced to obtain zinc.
`ZnO + C rarr Zn + CO`
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