Question

using the information in the graphic, how many neutrons are there in the most common isotope of aluminum? 27 13 14 26

Explanation:

Step1: Identify atomic number and mass number

The atomic number of aluminum (Al) is 13 (top - left number in the periodic - table symbol). The most common isotope of aluminum has a mass number of approximately 27 (since the atomic mass is 26.98 and rounded up).

Step2: Use neutron - calculation formula

The number of neutrons ($n$) is calculated by the formula $n = A - Z$, where $A$ is the mass number and $Z$ is the atomic number. So, $n=27 - 13$.

Step3: Calculate the number of neutrons

$27-13 = 14$.

Answer:

14