The mass of ¹²C is 12 u where 1 u = 1.660 559 × 10−²⁷ kg.This mass is equal to A)the mass of the ¹²C nucleus. B)the mass of the ¹²C nucleus plus 6 electrons. C)the mass of the ¹²C nucleus plus 12 electrons. D)the mass of 6 protons and 6 neutrons.

Question

Quizplus · Accepted Answer

The mass of $^{12}C$ (carbon-12) includes the mass of its nucleus plus 6 electrons, since a neutral carbon atom has 6 protons (and thus 6 electrons to balance the charge).

The Mass of 12C Is 12 U Where 1 U

The Mass of ¹²C Is 12 U Where 1 U