Because the members of a group have the same number of valence electrons.
The reason for similar properties among the elements is due to the resemblance in the electronic configuration of all the elements of a family. For example :- Each element of Alkali metals family has 1 electron in their outermost shell. Hence, they all have similar properties
similar chemical properties and characteristics
Both elements, sodium (Na) and potassium (K) lie in the Group 1 column of the Periodic Table , which contains the members of the Alkali Metals family. Members within a family, or column, of elements tend to have similar chemical properties.
Chlorine and Bromine have similar properties. You can tell because they are in the same vertical column in the periodic table.
The elements in a group have the similar chemical properties dueto presence of same no of electrons in their outermost shell but they differ physically because physical properties are related to their atomic sizes from top to bottom in a group atomic size increases so their physical properties also differ.
Due to valency electron in the orbital in different element shows different bonding property.
Elements in the same family-assuming family means classifications such as non-metals, metals-have similar properties.
Elements in the same family, or group, have similar physical and chemical properties.
family
family
Elements from a family have similar chemical properties.
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 reason for similar properties among the elements is due to the resemblance in the electronic configuration of all the elements of a family. For example :- Each element of Alkali metals family has 1 electron in their outermost shell. Hence, they all have similar properties
similar chemical properties and characteristics
Both elements, sodium (Na) and potassium (K) lie in the Group 1 column of the Periodic Table , which contains the members of the Alkali Metals family. Members within a family, or column, of elements tend to have similar chemical properties.
Elements in the same column have similar chemical properties. They are from the same family.
those elements are in the same 'family' or 'group'