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Question

The valency of magnesium and chlorine in magnesium chloride is:


A

Magnesium 1 and chlorine 2

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B

Magnesium 1 and chlorine 1

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C

Magnesium 2 and chlorine 2

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D

Magnesium 2 and chlorine 1

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Solution

The correct option is D

Magnesium 2 and chlorine 1


Magnesium (Atomic number = 12) has electronic configuration 2, 8, 2. It loses 2 electrons to complete octet configuration in its valence shell. Chlorine (Atomic number = 17) has electronic configuration 2, 8, 7. It gains 1 electron to complete octet configuration in its valence shell.


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