How many protons neutrons and electrons for 181Ta 5?

Answer 1

I'm assuming the symbol actually looks like this: 181Ta5+ If that's the case, it means that the mass number is 181, the element is tantalum, and the charge is +5. The atomic number of Ta is 73 (determined from the Periodic Table, see: http://www.webelements.com), so that tells it has 73 protons. The mass number if the # of neutrons + # of protons, so it has 181 - 73 = 108 neutrons. If it has a +5 charge, it must have 5 electrons less than the number of protons, so 73 - 5 = 68 electrons.

Answer 2

Tantalum-181 (181Ta) contains 73 protons and 108 neutrons. Since it is a neutral atom (no charge specified), it will also have 73 electrons to balance the charge from the protons.