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Structure of Atom
Question
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Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is

  • Mg2X3

  • MgX2

  • Mg3X2

  • Mg2X

Answer

C.

Mg3X2

Element (X) electronic configuration

1s2 2s2 2p3

So, valency of X will be 3.
Valency of Mg is 2.
Formula of the compound formed by Mg and X
will be Mg3X2

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