Question

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

a) Na⁺ and O²⁻
b) K⁺ and Cl²⁻
c) Ca²⁺ and S²⁻
d) Mg²⁺ and O²⁻

Answer 1

The +1 charged ion with the electron configuration 1s²2s²2p⁶6s²3p⁶3d¹40s⁴4p⁶ is Cd+, and the -2 charged ion with this configuration is Se2-. The available answer choices do not include these ions.

Step-by-step explanation:

The question asks which ions have the electron configuration 1s²2s²2p⁶6s²3p⁶3d¹40s⁴4p⁶. A +1 charged ion with this configuration is the Cd+ ion, which is obtained when a neutral cadmium atom (with one additional electron in the 5s orbital) loses one electron. Since a cadmium atom has the electron configuration 1s²2s²2p⁶3s²3p⁶3d¹40s²4p¶5s², losing two electrons will leave the +1 ion with the configuration 1s²2s²2p⁶6s²3p⁶3d¹40s²4p¶.

For the ion with a -2 charge having this electron configuration, the answer is Se2-. A neutral selenium atom has the electron configuration 1s²2s²2p⁶3s²3p⁶3d¹40s²4p⁶4. Gaining two electrons fills the 4p orbital, resulting in the same electron configuration as given for the -2 charged ion.

So, the correct answer is not directly listed in the options provided. The options a) Na+ and O2-, b) K+ and Cl2-, c) Ca2+ and S2-, and d) Mg2+ and O2- do not include the ions with the electron configuration given in the question.