Final answer:
Approximately 75 million atoms would line up along a 1.5 cm line, calculated by multiplying the fifty million atoms that fit in a 1 cm line by 1.5.
Step-by-step explanation:
To answer the question of how many atoms line up along a 1.5 cm line, we need to apply some basic mathematical conversion. According to the given information, it would take about fifty million atoms to make a line that is 1 cm long. Therefore, to find out how many atoms there are in a 1.5 cm line, we multiply fifty million (the number of atoms in 1 cm) by 1.5. This calculation gives us the approximate number of atoms:
50,000,000 atoms/cm × 1.5 cm = 75,000,000 atoms.
So, along a 1.5 cm line, there would be approximately 75 million atoms.