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Modern Periodic Table

Some allotrop...

Question

Some allotropes of selenium display characteristics of a metalloid, even though selenium is usually considered a non-metal.

A

True

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B

False

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Solution

The correct option is A True
The given statement is true.
Some allotropes of selenium display characteristics of a metalloid, even though selenium is usually considered a non-metal.
Note: Selenium, is considered as a metalloid in environmental chemistry due to similarities in its aquatic chemistry with that of arsenic and antimony.

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The gray allotrope of selenium, commonly referred to as the 'metallic' allotrope, despite not being a metal, it is stable and has a hexagonal crystal structure.

The grey allotrope of selenium is made from spirals on selenium atoms, while one of the red allotropes is made of stack of selenium rings.

Q. At least how many known allotropes do selenium have?

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

The allotropic form of a non-metal, which is a good conductor of electricity is:

0.020 g

of selenium vapours at equilibrium occupying a volume of

2.463 mL

1 atm

27^{\circ}

C.
The selenium is in a state of equilibrium according to the reaction

3 S e_{2} (g) ⇌ S e_{6} (g)

What is the degree of association of selenium?
(Atomic weight of Se = 79 amu)

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