Question

An element X (atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z . Which of the following statements are true regarding this compound? 1. Molecular formula of Z is XY2. 2. It is soluble in water. 3. X and Y are joined by sharing of electrons. 4. It would conduct electricity in the molten state.

Answer 1

Answer:

1. Molecular formula of Z is XY2.

Explanation:

Elements X has electronic configuration (Z=12)

                  1S²2S²2P⁶3S²

Group= 2

so oxidation number =+2

Exement Y has E.C (Z=17)

                 1S²2S²2P⁶3S²3S⁵

Group= 17

so oxidation number =-1

Hence symbol of the compound will be XY₂