At Westonci.ca, we provide clear, reliable answers to all your questions. Join our vibrant community and get the solutions you need. Experience the convenience of getting reliable answers to your questions from a vast network of knowledgeable experts. Get precise and detailed answers to your questions from a knowledgeable community of experts on our Q&A platform.

An atom of aluminum (Al) has an atomic number of 13 and a mass number of 27. How many neutrons does it have?

A. 13
B. 14
C. 27
D. 40


Sagot :

To determine the number of neutrons in an atom, you use the following information:

1. Atomic Number (Z): This is the number of protons in the atom. For aluminum (Al), the atomic number is 13.

2. Mass Number (A): This is the total number of protons and neutrons in the atom. For aluminum, the mass number is 27.

The number of neutrons (N) in the atom can be found using the formula:
[tex]\[ \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \][/tex]

Given:
- Atomic number (Z) = 13
- Mass number (A) = 27

Using the formula:
[tex]\[ \text{Number of neutrons} = 27 - 13 = 14 \][/tex]

Therefore, the aluminum atom has 14 neutrons.

The correct answer is:
B. 14