For an unknown sample of the experiment, students measure 1603 counts when they first receive their sample and 1382 counts 4.5 minutes later. Calculate the half-life t1/2 of their sample.

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

What is the correct term for living the most sustainable life you can within your current circumstances?

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li