8. Which two elements do not have unpaired electrons in their ground state ? 1) I 2) Ne 3) Be 4) Li 5) Cs Answer (score:1):

The correct answer is 2) Ne and 5) Cs.<br /><br />Neon (Ne) has a complete set of electrons in its outermost shell, with all electrons paired. Cesium (Cs) also has a complete set of electrons in its outermost shell, with all electrons paired.<br /><br />Iodine (I), Beryllium (Be), and Lithium (Li) all have unpaired electrons in their ground state.