Answer question numbers 17.(i) to 17.(iv) on the basis of your understanding of
the following paragraph and the related studied concepts.
This question refers to the elements of the periodic table with atomic numbers from 3
to 18. Some of the elements are shown by letters but letters are not the usual symbol
of the elements.
3 4 5 6 7 8 9 10
A E G
11 12 13 14 15 16 17 18
B C D F
17.(i) Which of these is a noble gas and which is a halogen?
17.(ii) Which of the above is an alkali metal?
17.(iii) Name an element having valency 4?
17.(iv)If A combines with F, what would be the formula of the resulting compound
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