Examlex
When the movie rating system began in the late 1960s, the G, PG, PG-13, R, X, and NC-17 ratings were all developed at that time and put immediately into place.
Transition Metals
Elements found in the middle of the periodic table that are characterized by their ability to form compounds with variable oxidation states and colored compounds.
Noble Gases
Inert gaseous elements that belong to Group 18 of the periodic table, known for their lack of chemical reactivity.
Halogens
A group of elements found in Group 17 of the periodic table, characterized by their high reactivities and tendencies to form salts with metals.
Main Group Non-metal
Elements located in the s and p blocks of the periodic table, excluding metalloids and metals, essential for various biological and industrial processes.
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