valence electrons are located in the outer shell electron that is associated with an atom in the periodic table.
where are valence electrons in the periodic table?
outer shell electron that is associated with an atom
core electron





























core electrons are the electrons in an atom that are not valence electrons and therefore do not participate in bonding. the number of valence electrons of an element can be determined by the periodic table group of the element. with the exception of the transition metals in groups 3-12 and the lanthanide and actinide series, the number of valence electrons ranges from 0-8 electrons. all the non-valence electrons for an atom of that element are considered core electrons.
core electron
however, in the group 13 elements electronegativity increases from aluminium to thallium, and in group 14 electronegativity of lead is lower than that of tin.





























section::::valence electrons.





























valence electrons are the electrons in the outermost electron shell of an isolated atom of an element. sometimes, it is also regarded as the basis of modern periodic table. in a period, the number of valence electrons increases (mostly for light metal/elements) as we move from left to right side. however, in a group this periodic trend is constant, that is the number of valence electrons remains the same.





























section::::valency.
periodic trends