Question

write the complete ground - state electron configuration of li.
for multi - digit superscripts or coefficients, use each number in succession.

Explanation:

Step1: Determine the atomic number of Li⁻

The atomic number of Li (lithium) is 3. For Li⁻, it has one extra electron, so the total number of electrons is \(3 + 1=4\).

Step2: Write the electron configuration

According to the Aufbau principle, electrons fill orbitals in the order of increasing energy (\(1s<2s<2p<3s\cdots\)). The \(1s\) orbital can hold a maximum of 2 electrons, and the \(2s\) orbital can also hold a maximum of 2 electrons. So the electron configuration of \(Li^{-}\) is \(1s^{2}2s^{2}\).

Answer:

\(1s^{2}2s^{2}\)