*WILL GIVE A BRAINIEST & 15 POINTS TO THE CORRECT ANSWER* A sodium atom has the following electron configuration: 2-7-1-1. This is the excited state because the electron is moving from

A.) 4th shell to 2nd shell
B.) 2nd shell to 4th shell
C.) 3rd shell to 2nd shell
D.) 2nd shell to 3rd shell

2nd shell to the 4th shell

Explanation:it is in the excited state because the electrons have been moved to higher energy levels and do not fully fill the lower levels, as an atom in the ground state would, the second shell has moved to the fourth shell and not all 11 electrons are in their lowest energy level

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explanation:

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.