Here's how to calculate the number of atoms in a glucose molecule (C6H12O6):

* Count the subscripts: The subscripts in the chemical formula tell us how many of each type of atom are present:

* C6: 6 carbon atoms

* H12: 12 hydrogen atoms

* O6: 6 oxygen atoms

* Total atoms: Add up the number of each type of atom: 6 + 12 + 6 = 24 atoms

Therefore, there are 24 atoms in a single molecule of glucose (C6H12O6).