This is the alkali metals family; the ionization energy is lower for these chemical elements.
There are 8 valence electrons in the noble gases, the family of elements furthest to the right on the periodic table.
The Iron Family
As,Arsenic belongs to nitrogen family in periodic table so it has 5 valence electrons.
Elements in the same family (group) on the periodic table have the same number of valence electrons and hence they have similar properties and reactivities.
carbon
A family is a column in a periodic table; all elements in a family have similar physical and chemical properties, because they have the same numbers of valence electrons (outer electrons).
There are 8 valence electrons in the noble gases, the family of elements furthest to the right on the periodic table.
The Iron Family
valence electrons
Each group/family on the periodic table can determine valence electrons by the last number of the group/family number, like helium. It's a noble gas that has 8 valence electrons because it's on the 18 family/group
One valence electron.
Noble gasses have the complete octet of valence electrons. The are in the family 18 of the periodic table. They are unlikely to react with other elements.
As,Arsenic belongs to nitrogen family in periodic table so it has 5 valence electrons.
They have the same amount of valance electrons.
The second family is called Alkaline Earth Metals. They have 2 valence electrons.
carbon
Elements in the same family (group) on the periodic table have the same number of valence electrons and hence they have similar properties and reactivities.