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Question

Elements X and Y form an ionic compound. Name the compound formed by X and Y.
(Atomic number of X is 11 and Y is 9)
  1. Sodium fluoride

  2. Magnesium oxide

  3. Sodium chloride

  4. Magnesium fluoride


Solution

The correct option is A

Sodium fluoride


The atomic number of X is 11.
Electronic configuration of X is: 2,8,1
Therefore, element X is sodium.

The atomic number of Y is 9.
Electronic configuration of Y is: 2,7
Therefore, element Y is fluorine.

X loses one electron and Y gains one electron forming an ionic compound. Therefore, the compound formed by X and Y is sodium fluoride (NaF).

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