An oxygen atom picks up two additional, free-floating electrons. Is the charge of the newly formed oxygen ion positive, negative, or neutral?

net charge of the oxygen atom is NEGATIVE

Explanation:

As we know that an oxygen atom is initially neutral

Atomic number of oxygen atom is 8

Atomic number of oxygen shows the total number of protons in it

now we can say that for neutral condition of oxygen atom we have

number of electrons = 8

number of protons = 8

Now if the neutral atom add up by two more electrons then

total number of electrons in it = 8 + 2 = 10

total number of protons = 8

so here net charge of the oxygen atom is NEGATIVE

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