Question

difference between valence shell nd penultimate shell???​

Answer 1

Answer:

Penultimate shell is the shell just before the valence or the ultimate shell .i.e.,the second last shell of the atom. The outermost shell of an atom is called the valence shell . ... Here the shell that contains 1 electron is the valence shell and the shell that contains 8 electrons is called the penultimate shell .

Hope the answer helps you mark me as brainleast

Answer 2

Answer:

valence shell is the outermost shell from which electrons are accepted or donated

the penultimate shell contains 18 electrons.ex (copper (2,8,18,1)However the penultimate shell has not attained stability and one or more electron sometime jumps to the outermost shell thereby increasing the valency electron.Hence the atom has new configuration(2,8,17,2) therefore copper exibhits Cu1+ & Cu2+ valency