The position of some elements A, B, C, D, E, F, and G in the Modern Periodic Table is given as under. (a) In which group are inert elements placed ? (b) What type of ions would B, C, E, and F form ? (c) Which element would have chemical properties similar to C ? (d) How many shells can A have ? (e) What is the similarity between A and D ? (f) Identify the most abundant element in the earth's crust.

The position of some elements A, B, C, D, E, F, and G in the Modern Pe

1.	The position of some elements A, B, C, D, E, F, and G in the Modern Periodic Table is given as under. (a) In which group are inert elements placed ? (b) What type of ions would B, C, E, and F form ? (c) Which element would have chemical properties similar to C ? (d) How many shells can A have ? (e) What is the similarity between A and D ? (f) Identify the most abundant element in the earth's crust.
Answer» Solution :(a) INERT elements are placed in group 18. These are A, D, G. (b) All the elements are expected to FORM anions Since their atoms tend to achieve noble gas configuration by accepting electrons. These are : `B^(2-),C^(-),E^(2-)" and "F^(-)` ions. (c) Element F would have chemical properties similar to C because both belong to the same group (17). (d) Since element A belongs to 1st PERIOD, it has only one shell. (e) Both elements A and D have completely filled VALENCE shells. (f) The element B (oxygen) is the most abundant (46.6%) in earth's crust.