What is the difference between atom a and atom b? a - 1s22s22p63s1 b - 1s22s22p65s1 answers to choose from: 1) atom b has lost some inner electrons. 2) the outer electron of atom b has moved to a lower energy state. 3) the outer electron of atom b has moved to a higher energy state.

2) The outer electron of atom B has moved to a lower energy state.

Explanation:

Properly writing the sublevel notations:

        Atom A = 1s² 2s² 2p⁶ 3s¹

         Atom B = 1s² 2s² 2p⁶ 5s¹

Solution:

According to the Aufbau's principle, "the sublevels with the lower energies are filled up before those with higher energies".

The pattern of filling is shown below:

      1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5d, 6s, 4f, 5d, 6p, 7s, 5f, etc.

The configuration of atom A having a total of 11 electrons follows the Aufbau's rule as we can see.

For atom B, we see a higher energy level which is the 5s coming into the lower energy orbitals. Therefore, the outer electrons of atom B has moved to a lower energy state.

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