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Who is credited with creating the first widely recognized periodic table of elements?
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2. Atoms & Elements
Periodic Table: Classifications
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Which of the following groups of elements typically exhibit luster (are shiny)?
A
Nonmetals
B
Noble gases
C
Metals
D
Halogens
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Understand that luster, or shininess, is a physical property commonly associated with the way a material reflects light from its surface.
Recall that metals have a characteristic metallic luster due to the presence of free electrons that can reflect light efficiently.
Recognize that nonmetals generally do not exhibit luster; they tend to be dull or transparent rather than shiny.
Note that noble gases are gases at room temperature and do not have a solid surface to exhibit luster.
Identify halogens as nonmetals that typically do not have metallic luster; they are often colored and can be reactive but not shiny like metals.
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