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In the following diagram for the first t...

In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters `a,b,c,d` and `e` (which are not their chemical symbols):

(i) Select the letter which represents a halogen.
(ii) Select the letter which represents a noble gas.
(iii) What type of bond is formed between `a` and `b`?
(iv) What type of bond is formed between `c` and `b`?
(v) Which element will form a divalent anion?

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