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Abundance of Elements

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Question

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_ and __ metal exists in allotropic forms.

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Solution

Tin:

grey tin (alpha-tin)
white tin (beta tin)
rhombic tin (gamma)

Iron:
ferrite (alpha iron)
beta
gamma
delta

Titanium: It has two allotropes

Strontium: It has three allotropes

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Q. Question 30
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous; non-sonorous; non-malleable and are coloured.
(a) Name a lustrous non-metal.
(b) Name a non-metal which exists as a liquid at room temperature.
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Q. An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet-like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.
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