e) 0,0000000001 $10^{-10}$ f) 0,0000001 $10^{-4}$

Step 1 ：Convert the given decimal numbers into scientific notation:

Step 2 ：e) 0.0000000001 = \(1.0 \times 10^{-10}\)

Step 3 ：f) 0.0000001 = \(1.0 \times 10^{-7}\)

Step 4 ：\(\boxed{\text{Final Answer:}}\)

Step 5 ：e) \(\boxed{1.0 \times 10^{-10}}\)

Step 6 ：f) \(\boxed{1.0 \times 10^{-7}}\)