For 42He*2 The atomic number is f and there are are protons. The mass number is and there are nucleons. There are neutrons. The charge is and there are are electrons. This radiation is called a. alpha b. beta C. gamma d. 0 е. 1 f. 2 g. 3 h. 4 i. 5 j. 6

Many radioactive isotopes are used in medicine for imaging and treatment purposes. The specific isotopes used depends on the particular organ or body system being studied (for example, Xe-133 is used to image lung function and blood flow.) Technetium-99m is a common radioactive isotope using for a variety of medical applications.  It is produced from the decay of Molybdenum-99 and has a half-life of 6.01 hours. What are some of the applications of Tc-99m? While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73 hours.  If it were easier to harvest, would this be a good substitute for Tc-99m? (remember to explain why for full credit) While Tc-99m has a half-life of 6.01 hours, its decay product has a half-life of 213,000 years.  While the medical community considers it to be reasonably safe, within the limits of testing, does this make sense considering both chemical and biological principles? What are possible ways that you might deal with or…

3) Which of the following is used to precipitate the nucleic acids Select one O a. Ethanol O b. Glycerol O c. Methanol O d. Ethylene

What is the total number of valence electrons in CO 2?     14     16     19     20     24