QUESTION 6

1. An element X, with an electron configuration 2,8,2 and an element Y, with an electron configuration 2,7 would probably form an ionic compound with a formula:

QUESTION 5

1. The table below lists the first six ionisaton energies (IE₁-IE₆), in kJ mol^-1, for four unknown elements labelled A, X, R and T.

   Element	IE1	IE2	IE3	IE4	IE5	IE6
   A	494	4 560	6 940	9 540	13 400	16 600
   X	736	1 450	7 740	10 500	13 600	18 000
   R	1 090	2 350	4 610	6 220	37 800	47 000
   T	1 400	2 860	4 590	7 480	9 400	53 200

   Which element - A, X, R or T - is likely to be in Group IV of the Periodic Table?

   		R
   		T
   		A
   		X