The significant figures of the number 6.0023 are

The correct answer is 5.

To determine the number of significant figures in the number 6.0023, we can apply the standard rules for significant figures:

1. Non-zero digits: All non-zero digits are always significant. In 6.0023, the digits 6, 2, and 3 are non-zero, making them significant.
2. Captive zeros: Zeros between two non-zero digits are always significant. The two zeros in 6.0023 are located between the non-zero digits 6 and 2, which makes them significant.

Counting the significant digits in the number:
$6.0023$
We have the digits 6, 0, 0, 2, and 3, which are all significant.

Therefore, the total number of significant figures is 5.