Assuming that "least nonmetallic" means the same as "most metallic", francium.
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Francium has the least nonmetallic character among the elements. It is an alkali metal in group 1 of the Periodic Table, and its properties are more metallic than nonmetallic elements.
The nonmetallic element in liquid state is bromine. Its chemical symbol is Br.
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Cadmium is the least metallic element among those listed. It is a transition metal with some nonmetallic properties and is less metallic than silver, zinc, and iron.
An example of a metallic element that occurs as a liquid at room temperature is mercury. An example of a nonmetallic element that occurs as a liquid at room temperature is bromine.
Bromine is the element that fits the description provided. It is a red nonmetallic liquid at room temperature and can cause skin and lung irritation upon contact or inhalation.