The element astatine (At), which appears at the bottom of the halogen column in

Question

The element astatine (At), which appears at the bottom of the halogen column in the periodic table, has been prepared artificially in minute amounts but has not been found in nature. Using the periodic law and your knowledge of the halogens, predict the properties of this element, as follows:

I. What is the formula for its compounds with hydrogen?

Answer:                            [ Select ]                       ["a.", "b.", "c."]      

II. What is the formula for its compounds with potassium?

Answer:

III. What is the formula for its compounds with calcium?

IV. Is its compound with potassium more or less stable than potassium iodide?

Explanation / Answer

I)

At is less electronegative than H.

so option B) AtH is the answer.

II)

K is less electronegative than At.

so ooption a) KAt is the answer.

III)

Ca have less electronegative and charge is +2. so to neutralize two At required because charge of At is -1.

so option C) CaAt2 is the answer.

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