How do you think the number of valence electrons relates to an element's chemical properties?

Electrons in the outermost shell are called valence electrons, because it is their interactions that determine the chemical properties of an element. The columns that were set up to group elements by similar chemical properties turn out to be the exact same columns defined by the number of valence electrons.

the increase of protons   hope this

65uuyhjghj8ykitdyidii