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Which contains elements with similar properties in the periodic table?
a period
a row
a column
a column
In the periodic table, elements with similar properties are found in both a period and a column.
A period is a horizontal row in the periodic table, and elements in the same period have the same number of electron shells, which affects their chemical behavior.
On the other hand, a column in the periodic table is called a group or a family. Elements in the same group have similar chemical properties because they have the same number of valence electrons, which determines their reactivity.
So, elements with similar properties can be found both in the same period (row) and the same column (group) in the periodic table.