1. This question is concerned with the elements in Period 5, Rb to Xe.

The electron distributions of some of these elements are given in the following list.

• element A    2 + 8 + 18 + 10

• element B    2 + 8 + 18 + 18 + 8

• element C    2 + 8 + 18 + 18 + 5

• element D    2 + 8 + 18 + 18 + 6

• element E    2 + 8 + 18 + 18 + 4

• element F    2 + 8 + 18 + 18 + 7

i) Identify element C.

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ii) Which element in the list does not form any compounds?

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iii) Which element in the list forms a chloride of the type XCl₂?

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iv) Which two elements would react together to form a compound of the type XY₄?

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v) Which element in the list would react with cold water to form an alkaline solution and hydrogen?

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