7Search.ccprotactinium atomic numberprotactinium atomic numberprotactinium number of protonsprotactinium symbol periodic tableprotactinium on the periodic tableatomic mass of protactiniumchemical symbol for protactiniumhow many protons does protactinium havewhat is the symbol for protactiniumhow many electrons does protactinium havechemical properties of protactiniumelectronic configuration of protactiniumelectron configuration of protactinium
