Study the following table in which positions of six elements A,B,C, D,

1.	Study the following table in which positions of six elements A,B,C, D, E and F are shown as they are in the modern periodic table :Group→Period↓123-121314151517181.2.ADEBCFOn the basis of the above table,answer the following questions:(i) Name the element which forms only covalent compounds.(ii) Name the element which is a metal with valency three.(iii) Name the element which is a non-metal with valency three.(iv) Out of D and E, which is bigger is size and why ?(v) Write the common name for the family to which the elements C and F belong.
Answer» (i) Element E will form covalent compounds by sharing its four valence electrons. (ii) Element D is a metal with valency three. (iii) Element B is a non-metal with valency three. (iv) We know that the size of elements decreases on moving left to right in a period. Therefore, element D is greater than element E. (v) The name of the family to which elements C and F belong is the noble gas family (group 18).

Study the following table in which positions of six elements A,B,C, D, E and F are shown as they are in the modern periodic table :Group→Period↓123-121314151517181.2.ADEBCFOn the basis of the above table,answer the following questions:(i) Name the element which forms only covalent compounds.(ii) Name the element which is a metal with valency three.(iii) Name the element which is a non-metal with valency three.(iv) Out of D and E, which is bigger is size and why ?(v) Write the common name for the family to which the elements C and F belong.

Answer»

(i) Element E will form covalent compounds by sharing its four valence electrons.

(ii) Element D is a metal with valency three.

(iii) Element B is a non-metal with valency three.

(iv) We know that the size of elements decreases on moving left to right in a period. Therefore, element D is greater than element E.

(v) The name of the family to which elements C and F belong is the noble gas family (group 18).