Question

using the information in the graphic, what can you assume is the mass of the most common isotope of the element aluminum? 26 40 27 13

Explanation:

Step1: Recall atomic mass concept

The atomic - mass value on the periodic table is the weighted average of the masses of all naturally - occurring isotopes of an element. The most common isotope of an element has a mass close to the atomic mass value rounded to the nearest whole number.

Step2: Round the atomic mass of aluminum

The atomic mass of aluminum (Al) is 26.98. Rounding 26.98 to the nearest whole number gives 27.

Answer:

C. 27