0.693 23. the relationship between the half-life of a nuclide and its rate constant is given by plutonium -236 (236pu) is an alpha emitter with a half-life of 2.86 years. if a sample initially contained 1.35 of 236pu, what mass of 236pu is present after 5 years? (10 marks) k

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive