An element 3517X and 4020Y are to be placed in the periodic table. (a) In which group and period will X and Y be placed? (b) State whether they are : 1. Metal or non-metal. 2. Oxidising agent or reducing agent. (c) Can these two atoms combine to form a compound ? If yes, can you predict 3 properties of this compound? (d) Write the formula of their oxide.

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Given elements are: So, atomic number of X = 17 and atomic number of Y = 20. (a) Group and period of X and Y For X: Atomic number = 17 Electronic configuration = 2, 8, 7 Since X has 3 shells, it belongs to Period 3. Since X has 7 valence electrons, it belongs to Group 17. For Y: Atomic number = 20 Electronic configuration = 2, 8, 8, 2 Since Y has 4 shells, it belongs to Period 4. Since Y has 2 valence electrons, it belongs to Group 2. (b) Nature of X and Y 1. X is a non-metal, while Y is a metal. 2. X is an oxidising agent, as it tends to gain electrons. Y is a reducing agent, as it tends to lose electrons. (c) Formation and properties of compound: Yes, X and Y can combine to form a compound. Y loses two electrons to form a Y2+ ion. Each X atom gains one electron to form an X- ion. Hence, X and Y can combine and form an ionic compound. Three properties of this compound are: 1. The compound has high melting and boiling point. 2. It conducts electricity in molten or aqueous state. 3. It is soluble in water. (d) Formula of their oxides: - Oxide of X ⇒ X2O7 (As X is Chlorine [Cl], hence formula of its oxide will be Cl2O7) - Oxide of Y ⇒ YO (As Y is Calcium [Ca], hence formula of its oxide will be CaO) Explanation: For X: X has atomic number 17 and electronic configuration 2, 8, 7. It belongs to Group 17. Its valency with respect to oxygen is 7. Oxygen has valency 2. By criss-crossing the valencies, the formula of the oxide of X is: For Y: Y has atomic number 20 and electronic configuration 2, 8, 8, 2. It belongs to Group 2. Hence, its valency is 2. Oxygen also has valency 2. By criss-crossing and simplifying, the formula of the oxide of Y is: Hence, the formulae of their oxides are: X2O7 and YO

Chemistry

Periodic Table

Related Questions

Assertion (A): Group 17 elements are known as alkaline earth metals.
Reason (R): Group 17 elements are salt formers.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.

Chemistry

Periodic Table

Related Questions

Assertion (A): Group 17 elements are known as alkaline earth metals.Reason (R): Group 17 elements are salt formers.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Assertion (A): Group 17 elements are known as alkaline earth metals.
Reason (R): Group 17 elements are salt formers.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.