2 structures of the periodic table

The basic layout of the current periodic table has:
Columns known as groups, the elements inside each of which having similar properties.
Rows known as periods. The elements in a given period have the same number of electron shells.

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Conflicts arising from drug cartels and goverment corruption is an issue that would most likely be considered as mexico's most challenging problem of today. the correct option among all the options that are given in the question is the third option or option "c". this problem has continued for a very long time.