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Lanthanoids are not generally supposed to be radioactive, with exception of mentioned very long lived radioisotopes. The longest half-life radioactive nuclides of lanthanoids ( in years ) $\ce{^{150}Nd}:\ \pu{6.7e18}$ $\ce{^{151}Eu}:\ \pu{5e18}$ $\ce{^{148}Sm}:\ \pu{7e15}$ $\ce{^{144}Nd}:\ \pu{2.29e15}$ $\ce{^{152}Gd}:\ \pu{ 108e12}$ $\ce{...


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In my book it is given that first electron gain enthalpy is greater than second for elements. Should we compare the magnitudes in such cases or the actual numbers with signs? Successive Electron Gain Enthalpies After the addition of one electron atom becomes negatively charged and second electron is to be added to a negatively charged ion. Thus, due to ...


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