The last “missing” element from the first six periods waspromethium, which was finally discovered in 1947 amongthe fission products of uranium. Determine (a) the ratio ofthe number of neutrons in a 145Pm nucleus to the numberof protons, and (b) the number of electrons in a singlepromethium atom.

B С Complete each of the following equations. (Enter your answer in the form 2x. Enter He for an a-particle, e for a B-particle, y neutron, and H for a proton. Use the lowest possible whole number coefficients.) 1 (a) 18, F+?→ chemPad XX chemPad XX 15 ¹50+ He (b) ¹Li→ ¹Be + ? 1 121, (c) ¹2Sb +He- 51 chemPad XX +He? +n → Help Greek Help Greek 80 Help Greek W 20- Su... 990 MacBook Air DII FB a DD Ⓒ G for a y-particle, for a y-particle, e for a positron, 'n for a +1 P11

What is the mass (in grams) of one Ni-58 atom?

8 1 is called the mass defect. Its interpretation can be found in Einstein's mass-energy eq formed, some of the mass of its constituent protons and the neutrons gets converted i the nucleus together. 16 The most common oxygen isotope is 0, but the rarer isotopes O and 0 of this element also exist in nature. These less common isotopes are stable, and measurements of their abundances have proved crucial in many fields of scientific research. For example, in climate research studies, the ratio of O to 0 measured in natural Part C 8. waters, as well as in polar ice, can provide useful information on the precipitiation history in a given area. This is because water containing O evaporates less readily, and condenses more easily as precipitation, than water containing 0. What is the equivalent energy EB of the mass defect of an atom of 0? 8 18 8 Express your answer in megaelectron volts to four significant figures. 16 View Available Hint(s) ΑΣφ ? EB = MeV Submit Previous Answers

What is the mass of the other isotope of Boron given 11B has a mass of 11.0093 amu and an abundance of 80.1%?

(c) Calculate the mass percent of protons in the nucleus of each of these isotopes. % of protons in B is i 45.42 % of protons inB is 45.00

Q2. 1-3 Choose the correct answer.

Nuclear decay can be useful.  Generally, the radiation interacts with other matter in a specific way.  Consider the following item: (a) a PET scanner  For the above example, provide: the correct symbol (with atomic number and mass number) of the element used. A balanced equation that describes the decay that takes place. How the radiation interacts with matter in a way that provides a benefit.

I3 write a hypothesis for how you think that decay constant is related to the concentration of the isotope.

For an alpha (α) particle, give the number of protons:  neutrons:  electrons: