Answer the following question given this paragraph: 

According to the table, aluminum has an atomic number of 13. Therefore, every aluminum atom has 13 protons in its nucleus. Iron has an atomic number of 26. Therefore, every iron atom has 26 protons in its nucleus. Carbon has an atomic number of 6. Therefore, every carbon atom has 6 protons in its nucleus. Saylor URL: http://www. saylor. org/books.


Q: According to the table, aluminum has an atomic number of 13. therefore, every aluminum atom has 13 protons in its what?

 Choices:

- processes

- membrane

- components

- nucleus

A:
nucleus
