Need help A sample contains 18mg of radon-222. You estimate that this is 0.01% of the original isotope. How many half-lives have passed?

56.16 gregor mendel was the first scientist to use statistics to analyze scientific data. before mendel's experiments, scientists believed that organisms acquired traits from their environment and passed them on to their offspring. after mendel's discoveries were accepted, scientists realized that traits passed to offspring were the result of genes being passed from parents to offspring. this is an example of pls

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver