SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What type of element usually has a dullappearance and is generally NOT a good conductor of heat or electricity?
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Metal
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Metalloid
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Nonmetal
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Solid
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Explanation:
Detailed explanation-1: -Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite).
Detailed explanation-2: -Graphite (an allotrpoe of carbon) is a well known nonmetal which is a very good conductor of electricity.
Detailed explanation-3: -Luster: Nonmetals are generally nonreflective, dull, and lack a shiny or metallic surface. Density: Nonmetals are generally less dense than metals. Physical forms: Nonmetals exist in solid, liquid, or gas forms at room temperature.
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