Elements in same column have equal number of valence electrons. so they possess similar chemical properties.
They have the same Valency
Elements in a given column have the same number of valence electrons and hence the similar properties.
Chemicals in a column, or "group" have similar chemical properties.
they all have the same electrons.
Representative elements
groups
The noble gases, column 18 in the most common modern periodic table.
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.
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hydrogen
Chemical properties.