How many chloride ions are needed to cancel the +2 charge of magnesium in magnesium chloride?

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Solution

The correct option is B 2
Two chloride ions are required to cancel the +2 charge of magnesium in magnesium chloride because magnesium chloride is an ionic compound in which $M g$ atom changes to $M g^{2 +}$ cation by losing two valence electrons. Each $C l$ atom changes to $C l^{-}$ anion by gaining one electron which resembles the configuration of next noble gas, argon. To balance the two positive charge of magnesium, two chlorine atoms are required or two chloride ions are required.
The equation: $M g - 2 e^{-} \to M g^{2 +}$ , $C l_{2} + 2 e^{-} \to 2 C l^{-}$

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(a) Write down the electron arrangement in (i) a magnesium atom, and (ii) a chloring atom.
(b) How many electrons are there in the alence 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 leectrons.
(d) State wheter magnesium chloride will conduct electricity or not. Give reason for your answer.
(e) Why are covalent compounds generally poor conductors of electricity?

Q. How many chloride ions are needed to cancel the +2 charge of magnesium in magnesium chloride?

Q. How many chloride ions are needed to balance the +2 charge of magnesium in magnesium chloride?

Q. The atomic number of magnesium is 12. How many protons are there in the nucleus of magnesium atom? How many electrons and protons does an ion of magnesium which has a charge of +2 contain.

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