What is the complete ground state electron configuration for the beryllium atom?
Answer: The complete ground state electron configuration for the beryllium atom is 1s2 2s2.
Explanation: The ground state electron configuration represents the arrangement of all electrons in an atom’s energy levels (shells) and subshells when the atom is in its lowest energy state. Beryllium (Be), with an atomic number of 4, has four electrons. According to the Aufbau principle, electrons fill the lowest energy levels first. In beryllium’s case, the first two electrons occupy the 1s subshell, and the remaining two electrons go into the 2s subshell.