Group / Valence e’s 2 Period / Shells Symbol 7 Fr 3 7 Bromine 5 3 2 NM 7 3 M O Fr 4 Xe Liz LaRosa 5th Grade Science www.middleschoolscience.com 2009 1 M, NM, MD M Bromine NM Calcium M Sb 4 O Tl 3 6 M Element 3 6 Polonium 5 7 6 3 5 Symbol 2 Tl 6 Period / Shells 5 Calcium 6 Group / Valence e’s M 4 6 1 M, NM, MD Sb 2 4 Element Polonium 5 5 M Xe Liz LaRosa 5th Grade Science www.middleschoolscience.com 2009