what are groups and periods in the modern periodic table?
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GROUPS
Elements in a group share a common number of valence electrons. For example, all of the elements in the alkaline earth group have a valence of two. Elements belonging to a group typically share several common properties.THEY ARE VERTICAL COLOUMNS OF PERIODIC TABLE AND ARE 18 IN NUMBER..
PERIODS
Elements in a period share the highest unexcited electron energy level. There are more elements in some periods than others because the number of elements is determined by the number of electrons allowed in each energy sub-level.There are seven periods for naturally occurring elements
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