Because they have the same number of valence electrons and need the same number of electrons to fill their valence shells
Elements in the same family, or group, have similar physical and 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
Elements in the same group on the periodic table have similar chemical properties because they have the same number of valence electrons. Elements in the same family have similar physical properties because they have the same number of electron shells.
Sulphur and helium have entirely different properties. Sulphur has properties similar to group 16 elements. Helium has properties similar to group 18 elements.
number of electrons in valence (last) shell
family
family
Elements in the same family, or group, have similar physical and 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
Elements in the same group on the periodic table have similar chemical properties because they have the same number of valence electrons. Elements in the same family have similar physical properties because they have the same number of electron shells.
The groups each have different names. Group one is made up of Alkali Metals (except for Hydrogen). Group two is made of Alkali Earth Metals. The other groups include Transition Metals, Noble Gases, Poor Metals and Non Metals.
A group is often called a chemical family.
Elements in a family or group of main group elements share similar chemical properties due to having the same number of valence electrons. This leads to comparable reactivity and the ability to form similar types of chemical bonds with other elements. Additionally, elements in the same group often show trends in physical properties such as atomic size and ionization energy.
Elements with similar properties are typically located in the same vertical column, known as a group or family, on the periodic table. This is because elements in the same group have the same number of valence electrons, which influences their chemical behavior and reactivity.
A family of elements is a group (column) of the Periodic Table. The family of an element is the column it is in in the Periodic Table. In a family of elements, they all have similar properties. An Example of a Family of Elements;The Alkali Metals - Group 1LithiumSodiumPotassiumRubidiumCaesiumFrancium
Sulphur and helium have entirely different properties. Sulphur has properties similar to group 16 elements. Helium has properties similar to group 18 elements.
number of electrons in valence (last) shell