Question

aluminum-27 has a mass number of ________. a. 26.982 b. 27 c. 14 d. 13

Explanation:

The notation "Aluminum - 27" indicates that the mass - number of this isotope of aluminum is 27. The mass number is the sum of protons and neutrons in the nucleus of an atom and is given in the name of the isotope.

Answer:

B. 27