In scientific notation, a number is expressed in the form of \( a \times 10^n \), where \( a \) is a number greater than or equal to 1 and less than 10, and \( n \) is an integer.
Now, let's analyze the options:
- \( 1.1 \cdot 10^{213} \) - This is in scientific notation because \( 1.1 \) is between 1 and 10.
- \( 7.8 \cdot 10^{8} \) - This is in scientific notation because \( 7.8 \) is between 1 and 10.
- \( 3.02 \cdot 10^{-10} \) - This is in scientific notation because \( 3.02 \) is between 1 and 10.
- \( 35 \cdot 10^{4} \) - This is not in scientific notation because \( 35 \) is not between 1 and 10.
Therefore, the number that is not in scientific notation is 35 ⋅ 10^4.