PENELEPOO

The mass of an oxygen atom is found to be 1.33 times the mass of the carbon-12 isotope. Calculate the mass of oxygen in atomic mass units.

Considering that an up quark has a charge of +2/3 and a down quark has a charge of -1/3, which of the following represents the correct quark combination for a proton? A) 2 down, 1 up B) 0 up, 3 down C) 3 down, 3 up D) 2 up, 1 down