Q. 224.8( 6 Votes )

In the following

Answer :

(a) Inert elements are placed in group 18.


(b) Elements B and E are placed in group 16 that means these have 6 electrons in outermost shell and these elements require 2 electrons to acquire noble gas configuration. So elements B and E will form B2- and E2- type ions.


And elements C and F are placed in group 17 that means these have 7 electrons in outermost shell and these elements require only 1 electron to acquire noble gas configuration. So elements C and F will form C- and F- type ions.


(c) We know that elements with similar properties are placed in same group. So element F would have chemical properties similar to C.


(d) Since A is placed in 1st period so it has only one shell.


(e) A and D are placed in group 18 so these both elements have 8 electrons in outermost shell.


(f) Most abundant element in the earth’s crust is B because B is oxygen and oxygen is most abundant element in earth’s crust.

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