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Author Question: Most periodic tables indicate the elements for which all isotopes are radioactive. Which pair of ... (Read 64 times)

ENagel

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Question 1

In the reaction C + He → O how much energy is produced per gram of carbon used? Masses, in unified atomic mass units are: C= 12.00000, He= 4.00260, O = 15.99491.
Express your answer in Joules/gram of carbon.
◦ 2.10 × 1019 J/g
◦ 5.76 × 1010 J/g
◦ 7.77 × 104 J/g
◦ 2.80 × 1011 J/g
◦ 3.36 × 1015 J/g

Question 2

Most periodic tables indicate the elements for which all isotopes are radioactive. Which pair of elements with atomic number less than 83 have only radioactive isotopes?
◦ Pb and At
◦ Tc and Cd
◦ K and Pm
◦ Tc and Pm
◦ C and K


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Marked as best answer by ENagel on Jul 8, 2021

jgranad15

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Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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ENagel

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Reply 2 on: Jul 8, 2021
YES! Correct, THANKS for helping me on my review


olderstudent

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Reply 3 on: Yesterday
Great answer, keep it coming :)

 

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