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Atomic number of element A is 12 and tha...

Atomic number of element A is 12 and that of B is 8. (Symbols are not real)
a) Find the valencies of these elements by writing their electronic configuration.
b) Write the moleuclar formula of the compound formed when A and B combine together

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a) A-2,8,2 B-2,6
Valency: A-2, B-2
b) AB
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