Question

Which ion with a +1 charge has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶?

1) Na+
2) Ca+
3) K+
4) Mg+

Answer 1

The ion with a +1 charge and the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ is Rb⁺, which comes from the atom Rubidium (Rb).

Step-by-step explanation:

The question asks which ion with a +1 charge has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶. To determine the identity of this ion, we need to consider the neutral atom that would have one extra electron compared to this configuration.

The electron configuration corresponds to that of a noble gas, with all subshells completely filled, up to the 4p orbital. This is the electron configuration of Krypton (Kr), an atom with atomic number 36. Thus, the ion with this electron configuration and a +1 charge would be derived from the atom that comes directly after Krypton in the periodic table, which is Rubidium (Rb). Therefore, when Rubidium loses one electron, it forms Rb⁺ with this configuration.