Final answer:
The standard numeral for two hundred ten-billionths in scientific notation is 2.10 × 10^-10.
Explanation:
Two hundred ten-billionths can be represented as 0.000000000210 in standard numeral form. In scientific notation, this would be 2.10 × 10-10. This is because the value is 210 x 10-12, which simplifies to 2.10 x 10-10.
Learn more about Scientific Notation here:
https://brainly.com/question/16936662
