The elevation of a telescope is about 220 meters above sea level. Write 220 in scientific notation.

Step 1 ：The elevation of a telescope is about 220 meters above sea level. We are asked to write 220 in scientific notation.

Step 2 ：Scientific notation is a way of expressing numbers that are too big or too small to be conveniently written in decimal form. It is commonly used by scientists, mathematicians and engineers. In scientific notation, numbers are written as a product of two numbers: a coefficient and 10 raised to a power. The coefficient must be greater than or equal to 1 and less than 10. The power of 10 indicates the number of places the decimal point was moved to form the coefficient.

Step 3 ：In this case, the number 220 can be written in scientific notation by identifying the coefficient and the power of 10. The coefficient is 2.2 (which is between 1 and 10) and the power of 10 is 2 (since we need to move the decimal point 2 places to the right to get from 2.2 to 220).

Step 4 ：So, 220 is equivalent to 2.2 times 10 to the power of 2.

Step 5 ：Final Answer: The scientific notation of 220 is \(\boxed{2.2 \times 10^{2}}\).