Which of the following is the outermost shell for elements of period 2 ?

Which of the following is the outermost shell for clements of period 2?

Which is the outermost shell ?

Which of the following is the valence shell for the elements of second period of the modern periodic table?

Which is the outermost shell of sodium atom ?

Which is the outermost shell of hydrogen atom ?

Which is the outermost shell of fluorine atom ?

Which of the following general configuration of outermost shell represents chromium element? [Cr atomic number = 24]