Explain why calcium is generally more reactive than magnesium. Why do hydrogen atoms emit or absorb only discrete amounts of energy? Explain why even if a chemical reaction has a yield close to 100%, the atom economy may be poor.
Why is benzene less reactive than 1,3,5-cyclohexatriene? Why is it not advisable to react an acid with sodium chloride directly? What are atoms and why are they important? Why is the hydrated hydrogen ion important? Why is O_2 nonpolar? Why does iodine form the largest variety of inter...
(45) Why is cesium (Cs) more reactive than francium (Fr)? (46) How can we explain the difference in colours: tin dioxide (SnO2, white) but lead dioxide (PbO2, dark brown); [PbCl6]2− (yellow) but [SnCl6]2− (colourless), sodium bismuthate (NaBiO3, yellowish brown) but ...
The elements hydrogen and helium have a single orbital shell; elements in the second row of orbitals have two orbital shells and so on. The next inference we can make is from the 18 columns, known asgroups. All the elements in a group have the same number of electrons orbiting the nucleu...
Why does helium exhibit more emission lines than hydrogen? What are the basic features of El and Cl mode of ionization? What is their major difference? Why are alkali metals more reactive than alkaline-earth metals? Why does Cl- have a larger ionic radius than Ca2+ ? Explain why the dis...
Why are the elements of group 2A less reactive than the elements of group 1A? Why do transition elements form colored compounds? Explain why a magnesium atom is bigger than a sodium atom. Briefly explain the early theories of atomic structure. Why is hydrogen grouped in both groups 7 and 1...