How was plutonium first synthesized? What radioactive gas sometimes accumulates

Question

How was plutonium first synthesized? What radioactive gas sometimes accumulates in houses built in regions with lots of uranium in the ground? How does the color change as it is cooled below its freezing point? What element common to computers is found at the beach? What element has the highest melting point and the lowest vapor pressure of all metals? What element has the highest electrical and thermal conductivity of all metals? Would this element be good for making cooking pots? Why or why not? Would this metal be good for making electrical connectors? Why or why not? What is an allotrope? Identify the major allotropes of carbon and phosphorus. Zirconium and hafnium occur together in nature. It is ever so difficult to obtain the pure elements. a. Why do you think this is so?

Explanation / Answer

12. Uranium -238 was bombarded with deuterons in 1940 to synthesize Plutonium.

13.Radon is the radioactive gas accumulating. Also it emits color from colorless to yellow to orange -red if cooled below freezing point.

14. Silicon (Si) which is found on beaches as silica is also found in many components of computer as chips ,transistors as semiconductor.

15. Tungsten (W) has the highest melting point (3410) and lowest vapor pressure.

16.

Silver(Ag) has the highest thermal and electrical conductivity. But we cannot use it as pots or wires because of the high cost.

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