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Representative elements
groups
A group in the periodic table is a column of elements that share similar chemical properties due to having the same number of electrons in their outer energy level. Groups are vertical columns and are numbered from 1 to 18.
A group of elements.
hydrogen
Chemical properties.
groups or family:))
Yes, it is.
groups
a family is a column of elements a period is a row of elements
In the Periodic Table of the Elements, a column (group) contains all elements that exist with the group number of electrons in the outer energy level of an atom of that element.
A vertical column is called a 'group.' A horizontal row is called a 'period,' thus the periodic table.