Classification ...

An element X has electronic configuration 2, 8, 2. It forms ionic compounds with ions like nitrate, sulphate and phosphate. What will be the formulae of these compounds?

The amount of energy when a million atoms of iodine are completely converted into $$I^{-}$$ ions in the vapor state according to the equation,
$$I_{(g)} + e^{-} \rightarrow I^{-}_{(g)}$$ is 4.9 x 10$$^{-13}$$ J. What would be the electron gain enthalpy of iodine in terms of $$kJ\ mol^{-1}$$ and $$eV$$ per atom?

Which of the following represent correct order of decreasing $${\text{E}}_{{\text{ox}}}^{\text{O}}$$ or reducing nature?

The second electron gain enthalpy of O and S (in $$KJ{ mol }^{ -1 }$$) respectively are:

Which of the following elements will gain one electron more readily in comparison to other elements of their group?

Which one of the following statement is incorrect?

Electron gain enthalpy of $$17th$$ group elements are $$-349, -328, -325,-296, -270\ kJ/mol$$ (not in order). The element which has electron gain enthalpy $$-296 kJ/mol$$ is:

The electronic configuration of an element is $$1s^22s^22p^63s^23p^3$$ . The atomic number of the element, which is just below the above element in the periodic table is__

Which one of the following statements is incorrect?

Which of the following possess highest electron affinity: