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Write the electronic configurations of t...

Write the electronic configurations of the following elements.
(a) magnesium
(b) Silicon
(c ) Sulphur
(d) Argon

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(a) Magnesium `(Z=12)to(2,8,2)`
(b) Silicon `(Z=5)to(2,8,4)`
(c ) Boron `(Z=5)to(2,3)`
(d) Argon `(Z=18)to(2,8,8)`
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  9. Difine double decomposition reaction . Give an example.

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