GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Metal
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Non-metal
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Metalloid
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None of the above
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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: -Silicon has a shiny luster, but it is brittle and conducts electricity poorly. Some metalloids change their characteristics when they react with different elements.
Detailed explanation-3: -Non-metals do not have lustre. They do not reflect light from their surface. Non-metals have a dull appearance. Diamond and iodine are two exceptions and are lustrous non-metal.
Detailed explanation-4: -Luster: Most metals have a shiny or metallic appearance known as luster, which reflects light. Density: Metals are dense, solid materials that weigh more than nonmetals. Physical forms: Most metals are naturally solid at room temperature, except for mercury, which is liquid at room temperature.