What is the power of 10 when 0.00503 is written in scientific notation?

Scientific notation refers to a technique of writing number that are too large or too small in a decimal form, that will be convenient for use in calculations. It is the standard way of writing numbers that are either too small or too big, thus, it is also called standard form. When using scientific notation, all numbers are written in the form: Z * 10^a, where the exponent a is an integer and coefficient Z is a real number. For the question given above, the standard form of the number is 5.03 * 10^ -3. The exponent -3 refers to the three zeros that appear at the beginning of the number.

since electrons are negative the answer is neagtaive