An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide. (a) Where in the periodic table are elements X and Y placed? (b) Classify X and Y as metal (s), non-metal (s) or metalloid (s) (c) What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed (d) Draw the electron dot structure of the divalent halide



  • X is in Group 17, period 3
  • Y is in group 2 Period 4.


  • X is non-metal
  • Y is metal

(c) Y Oxide will be basic in nature. The compound is formed by an ionic bond.

Metallic oxides are basic in nature because they react with dilute acids to form salt and water. Group 1 & 2 oxides are highly alkaline in nature that is why group 1 is called alkaline metals and group 2 is called Alkaline Earth metals.

Electron dot structure of calcium chloride

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