1 and 2
families of elements with similar chemical properties are called groups.
a group of elements that have similar properties are arranged one on top of the other on the periodic table. These groups are also called families
The properties of chemical elements have a periodic trend.
Except noble gases the groups of elements in periodic table have the similar chemical properties but not the physical.
They have the same number of valence electrons and so have similar reactivity and similar properties.
The elements in the same groups usually do. Elements in the same group have same number of valence electrons and hence have similar chemical and physical properties.
The vertical elements are called groups. They have similar chemical properties.
Because the elements that have similar properties are arranged in groups - or 'periods'.
Groups are vertical and contain chemical elements with similar properties; periods are horizontal.
Elements with similar properties occur within the groups(columns) on the periodic table.Elements in the same group have same number of valence electrons and hence have similar chemical and physical properties.
In the periodic table, the elements are grouped according to their properties. Elements in a group has an equal number of valence electrons. So the elements in a group have most common chemical properties.
The most important principle was the listing in groups, after similar chemical or physical properties.