Question

Question:Which ion with a +1 charge has the electron configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶? Which ion with a –2charge has this configuration?

Short answer

An ion with +1 and the given configuration is rubidium. An ion with a -2 charge and the given configuration is selenium.

Step-by-step solution

determining ion with +1 charge having the given configuration  

Observing the periodic table, to identify atom with the electron configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶, we need to focus on 4s²4p⁶ and since the charge is given +1, we need to add 5s¹ to complete the configuration as per the given conditions. this leads us to Rb (rubidium).

determining ion with -2 charge having the given configuration  

Observing the periodic table, to identify the atom with the electron configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶, we need to focus on 4s²4p⁶ since the charge is given -2, we need to add 4p⁴ to complete the configuration as per the given conditions. this leads us to Se (selenium).