Explain the periodic trend in acid-base behaviour of the oxides of third period elements.

Compare the acidic nature of the oxides of Group 13 elements.

(i) Electron affinity of Cl is greater than that of E explain. (ii) Indicate the basic/acidic behaviour of the hydrides of following elements: F,C,O,N.

What is the change observed in the covalent character of the oxides of the elements starting from Na to Cl in the third period?

Period 2 consists of eight elements.

Which of these does not reflect the periodicity of the elements

How does the basicity of the oxides of representative elements vary on moving down a group in the periodic table? On moving across a period from left to right, how does the acidicty of the oxides of representative elements vary?

In a periodic table the basic character of oxides

The periodicity is related to the electronic configuration that is all chemical and physical properties are a manifestation of the electronic configuration of the elements.the atomic and ionic radii genreally decrease in a period from left to right as a consequence the ionization enthalpies genrally increase and electron gain enthalpies become more negative across a period in other words the ionization enthalpy of the extreme left element element in a period is the least and the electron gain enthalpy of the element on the extreme right is the highest negative.this results into highly chemical reactivity at the two extremes and the lowest in the centre similarly down the group the increase in atomic and ionic radii result in gradual decrease in ionization enthalpies and a regular decrease (with exception in some third period elements)in electron gain enthalpies in the csea of main group elements. reducing and oxidizing behaviour of the elements metallic and non metallic character of elements acidic,basic,amphoteric and neutral charcter of the oxides of the elements The correct order of the metallic character is

What is the number of elements in the 3rd period of the modernn periodic table?