Question

Of the five elements Sn, Si, Sb, O, Te, which has the most endothermic reaction? (E represents an atom.) What

name is given to the energy for the reaction?

\({\bf{E}}(g) \to {{\bf{E}}^ + }(g){\rm{ }} + {\rm{ }}{{\bf{e}}^ - }\)

Short answer

Oxygen will require the most energy for the reaction.

Step-by-step solution

Ionisation energy

Out of the given elements, we need to determine the element that will require the most energy to take an electron away nothing but ionization energy.

The trend of atomic radii in the periodic table is that the atomic radius increases as we go from right to left in the periodic table. The atomic radius increases going from top to bottom (increases in n energy levels and so the distance from the nucleus.

Ionisation energy for the given elements

The smaller the radius, the more ionization energy is required. Hence, observing the trend and the relation between energy and radius, we can conclude that the element that is farthest right and farthest upward in the periodic table, require the most energy. Hence,oxygen will require the most energy for the reaction.