Question

choose the correct electron configuration for beryllium (be). 1s² 2s² 2p¹ 1s² 2s² 1s¹

Explanation:

Beryllium has an atomic number of 4, meaning it has 4 electrons. Electrons fill orbitals in the order of increasing energy. The first two electrons go into the 1s orbital (1s²), and the next two go into the 2s orbital (2s²).

Answer:

1s² 2s²