The two groups that do not usually form ions include Group 14 and Group 18. Group 14 does not form ions. They do not gain or lose electrons either. Group 18 does not form ions because they contain stable noble gases.
Noble gases (group 18) because, they already have a complete octet
Elements of group 1 readily form ions having a charge of +1.
The lower the the Atomic Number, the higher the Ionic Energy.
The lower the the Atomic Number, the higher the Ionic Energy.
Ions are cations (positive) or anions (negative).
Metals tend to form positive ions also known as cations.
why atoms of group 0 elements do not form ions
Group 1 elements are the alkali metals, which form ions wih a 1+ charge.
Noble gases doesn't form ions.
Metals tend to form positive ions.
Chloride ions would form elements with ions of metallic elements. For example, with sodium ions, chloride ions form sodium chloride.
lose 2 electrons and form ions with a 2+ charge.
Elements of group 1 readily form ions having a charge of +1.
We haven't seen your graph. However, it is easy to say what kinds of ions elements form. Metals form positive ions and nonmetals form negative ions.
Generally this is a characteristic of the metallic elements.
cations = positively charged ions
The lower the the Atomic Number, the higher the Ionic Energy.
The lower the the Atomic Number, the higher the Ionic Energy.