Answer:
the answer is "I HOPE IT HELPS"
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.
2) the possible confirmation that follows Aufbau's principle is
D. </span><span>-[Kr] 5s24d105p3</span>
Common thing is that their outmost shell is completely filled with the electrons. They are inert gases.
Sapphire.
It is a stone not a metal.