Driving age in old Rome?

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Possible Answers: XVI.

Last seen on: LA Times Crossword 4 Nov 18, Sunday

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Random information on the term “XVI”:

In chemistry, a group (also known as a family[1]) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table, and the f-block columns (between groups 3 and 4) are not numbered. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core charge), as most chemical properties are dominated by the orbital location of the outermost electron.There are three systems of group numbering. The modern numbering group 1 to group 18 is recommended by the International Union of Pure and Applied Chemistry (IUPAC). It replaces two older naming schemes that were mutually confusing. Also, groups may be identified by their topmost element or have a specific name. For example, group 16 is variously described as the oxygen group and as the chalcogens.

In history, several sets of group names have been used:[2][3]

Some other names have been proposed and used without gaining wide acceptance: volatile metals for group 12; icosagens for group 13; crystallogens, adamantogens, and merylides for group 14; and aerogens for group 18.

XVI on Wikipedia