periodicity of valence

Periodic Table and Valency of Elements - a) Group IA, IIA and IIIA consists of metals of normal elements. They have 1, 2, or 3 valence electrons which they can easily donate to acquire the configuration of nearest noble gas. They become positively charged i.e., cations..

a) Group IA, IIA and IIIA consists of metals of normal elements. They have 1, 2, or 3 valence electrons which they can easily donate to acquire the configuration of nearest noble gas. They become positively charged i.e., cation..

The number of valence electrons increase from left to right in a period. So, the valency of the elements first increase from 1 to 4 and then decreases to zer..

When the elements are arranged in the order of increasing atomic numbers there is a recurrence of similar properties after certain regular intervals. This regularity is called the periodicity in properties. The distribution of electrons in the various shells determines their physical and ..

Atomic radii in general, decrease with increase in atomic number, going from left to right in a period. This is explained on the basis of increasing nuclear charge along a period. The nuclear charge increases progressively by one unit while the corresponding addition of one ele..

General Characteristics of Periods - 1. Valence shell electrons The valence shell electrons increase form one to seven as we move from left to right in a period. 2. Valency The valency of the elements with respect to hydrogen, increases fo..

Valence shell electrons : The valence shell electrons increase form one to seven as we move from left to right in a period..

The modern periodic table is based on the electronic configuration of the elements. The properties of an element are determined largely by the electrons in its outermost or valence shell. Valence electrons interact with other atoms and take part in all chemical reacti..

Members of the same group have similar electronic configuration of the valence shell and thus show same valency..

Main Features of Modern Periodic Table - 1. The modern periodic table is divided into two main categories: (i) Vertical columns called Groups and (ii) Horizontal columns called Periods. 2. There are 18 vertical columns or groups. These are further sub-divided into A an..