Period or group elements in the same row in the periodic table are referred to as a period. These elements have similar atomic sizes and chemical properties. The properties of elements gradually change across a period in a predictable way, from left to right.
Period or group elements in the same column in the periodic table are referred to as a group or a family. These elements have similar chemical and physical properties, and their valence electrons are in the same energy level. The properties of elements in the same group are similar because they have similar electronic configurations.
group or period elements in the same row in the periodic table
Period or group elements in the same column in the periodic table
also referred to as a family
Period or group properties of elements gradually changing across this category in a predictable way
period or group elements in this category having similar chemical and physical properties
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