Most periodic tables indicate the elements for which all isotopes ...

[ENagel]

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 × 10^{19 J/g}
◦ 5.76 × 10^{10 J/g}
◦ 7.77 × 10^{4 J/g}
◦ 2.80 × 10^{11 J/g}
◦ 3.36 × 10^{15 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

[jgranad15]

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[ENagel]

Gracias!

[xiazhe]

Thanks for the timely response, appreciate it