How many oxygen molecules are in a flask that contains 1.43 grams of oxygen?

(1.43 g O2) / (31.99886 g O2/mol) x (6.022 x 10^23 molecules/mol) = 2.69 × 10^22 molecules O2

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.