Recall that atoms gain or lose electrons to become ions. So, an ion has a different number of electrons than its corresponding neutral atom. Positive ions have lost electrons, and negative ions have gained electrons. The table includes the electron configuration of several ions. Complete the rows for magnesium and oxygen (oxide) ions by identifying the correct ion charge, electron configuration, and neutral atom with the same configuration as the ion. You may need to use online resources or the periodic table to determine the correct ion charges. Select the correct answer from each drop-down menu to complete the table.

2+/1s2 2s2 2p6/neon

2−/1s2 2s2 2p6/neon

Explanation:

Explanation:

A magnesium atom that loses two electrons to become a magnesium cation has the same electron configuration as neon. An oxygen atom that gains two electrons to become an oxygen anion also has the same electron configuration as neon.

IonIon ChargeElectron ConfiguratIonNeutral Atom with Similar

Electron ConfiguratIon

sodium1+1s2 2s2 2p6neon

magnesium2+1s2 2s2 2p6neon

aluminum3+1s2 2s2 2p6neon

potassium1+1s2 2s2 2p6 3s2 3p6argon

calcium2+1s2 2s2 2p6 3s2 3p6argon

nitrogen (nitride)3−1s2 2s2 2p6neon

oxygen (oxide)2−1s2 2s2 2p6neon

fluorine (fluoride)1−1s2 2s2 2p6neon

sulfur (sulfide)2−1s2 2s2 2p6 3s2 3p6argon

chlorine (chloride)1−1s2 2s2 2p6 3s2 3p6argon

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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