The rest mass of an electron is 0.000 000 000 000 000 000 000 000 000 000 910 938 kg. What is this written in Scientific Notation?

To write a number in scientific notation, it must be in the form a × 10^b, where 1 |a| < 10 and b is an integer. Step 1: Analyze the given number. The rest mass of an electron is given as 0.000\,000\,000\,000\,000\,000\,000\,000\,000\,910\,938 kg. Let's count the number of zeros after the decimal point before the first non-zero digit (9). There are 27 zeros. If we move the decimal point to the right until it is after the first non-zero digit (9), we move it 27 (zeros) + 1 (for the digit 9) = 28 places. Since we moved the decimal point to the right, the exponent of 10 would be negative. So, strictly based on the number as written, the scientific notation would be 9.10938 × 10^-28 kg. Step 2: Examine the provided options. All the options have an exponent of 10^-31. This indicates a discrepancy between the number written in the question and the options. The actual rest mass of an electron is a well-known physical constant, which is approximately 9.10938 × 10^-31 kg. It is highly probable that the long form of the number in the question contains a typo and was intended to represent this actual value. Step 3: Convert the intended value (actual rest mass of an electron) to scientific notation. Assuming the question intends to refer to the actual rest mass of an electron, which is 0.000...000_30 zeros910938 kg. To write this in scientific notation, we move the decimal point to the right until it is after the first non-zero digit (9). We count the number of places the decimal point moves: 30 (zeros) + 1 (for the digit 9) = 31 places. Since the decimal point is moved to the right, the exponent of 10 is negative. Thus, the scientific notation is 9.10938 × 10^-31 kg. Step 4: Compare with the given options to find the one in correct scientific notation format. • 910938 × 10^-31 kg (The 'a' part, 910938, is not ✂️ _That answer was long and got cut off. Reply continue and I'll finish it._