Which response includes only species that have the electron configuration 1s 2 2s 2 2p 6 3s 2 3p 6 , and no other species?

Cl- K+ Ar and P-3

Explanation:

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From the electronic configuration we can count 18 electrons.

Na+ has 10 electrons  (11 - 1 = 10)

Cl- has 18 electrons  (17 + 1 = 18)

K+ has 18 electrons  (19 - 1 = 18)

Ar has 18 electrons

Mg+2 has 10 electrons  (12 - 2 = 10)

P-3 has 18 electrons (15 + 3 = 18)

The electrons in the neutral atom are equal to the atomic number.

Negative charges are earned electrons and are added to the atomic number of the element to calculate the total electrons.

The positive charges are assigned electrons and are subtracted from the element's atomic number to calculate the total electrons.

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