Which electron configuration could represent the electrons in a sodium atom in an excited state?
(1) 2-8
(2) 2-8-17
(3) 2-7-1
(4) 2-7-2

Elements in which their valence atoms takes up higher energy orbitals compared to the ground state are said to be in an excited state. Hence, sodium atom in an excited state could have the electronic configuration 2 - 7 - 2

The number of atoms in sodium is 11. Hence, a ground state sodium would have the configuration ; 2, 8, 1

In an excited state, the outer shell could have more than 1 atom such as 2, 7, 2 ; with two atoms taking up the higher orbital instead of 1.

Therefore, a possible representation of sodium atom in an excited state is 2 - 7 - 2.

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Which electron configuration could represent the electrons in a sodium atom in an excited state? (1) 2-8 (2) 2-8-17 (3) 2-7-1 (4) 2-7-2

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Which electron configuration could represent the electrons in a sodium atom in an excited state?
(1) 2-8
(2) 2-8-17
(3) 2-7-1
(4) 2-7-2