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 : On 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.

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

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 : On 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» Solution :(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).