Periodic Table Period 1 I A 18 VIII A 1 1s 1 ?1 atomic # ? 29 +2,1 ? ions commonly formed 2 0 H 2 II A atomic symbol ? Cu 13 III A 14 IV A 15 V A 16 VI A 17 VII A He hydrogen English element name ? copper helium 1.008 63.55 ? atomic mass (rounded) 4.003 2 2s 3 +1 4 +2 2p 5 +3 6 ?4 7 ?3 8 ?2 9 ?1 10 0 Li Be B C N O F Ne