Question

write the electron configuration of an atom of the element highlighted in this outline of the periodic table:
hint: you do not need to know the name or symbol of the highlighted element!

Explanation:

Step1: Determine the number of electrons

The element is in period 3, group 1. The number of electrons in an atom of an element is equal to its atomic number. For period 3, group 1, the atomic number is 11.

Step2: Write the electron configuration

Using the Aufbau principle, electrons fill orbitals in order of increasing energy. The electron configuration for 11 electrons is \(1s^{2}2s^{2}2p^{6}3s^{1}\)

Answer:

\(1s^{2}2s^{2}2p^{6}3s^{1}\)