He was not all the way up the ladder he was only on the first couple steps
A ground state electron configuration follows the Aufbau Principle that states that electrons should be filled up in orbitals in increasing energy. In the given sequences, the right configuration is <span>1s2 2s2 2p6 3s2 3p6 4s2 3d8. The choice that conforms to this sequence is D. In 2) the possible confirmation that follows Aufbau's principle is D. </span>
I personally think that "There are more than 70 of them" and "Some are as large as planets" is the most unique.
Magnesium bromide is comprised of: Magnesium Mg (Atomic mass 24.3050) 1 atom with a mass percent of 13.201% and Bromine Br)Atomic mass 79.904) 2 atoms with a mass percent of 86.799%.
