Table of Contents
classification-of-elements-and-periodicity-in-properties-of-elements
The Periodic Table of Elements is a classification of all known elements in the universe. The table is arranged in order of atomic number, which is the number of protons in the nucleus of an atom. The elements are divided into groups and periods.
The groups are the vertical columns in the table. The elements in each group have similar chemical properties. The periods are the horizontal rows in the table. The elements in each period have similar physical properties.
The Periodic Table of Elements is also arranged in order of increasing atomic weight. The heavier the element, the higher it is on the table.
Elements are Classified into: s-, p-, d- and f- blocks.
The elements are classified into four blocks: s-block, p-block, d-block, and f-block. The s-block consists of the first two columns of the periodic table, which are made up of the alkali metals and the alkaline earth metals. The p-block consists of the next six columns of the table, which are made up of the p-block elements. The d-block consists of the next ten columns of the table, which are made up of the transition metals. The f-block consists of the last two columns of the table, which are made up of the lanthanides and the actinides.
Anomalous Properties of Second Period Elements
The anomalous properties of the elements in the second period are largely a result of their relatively low ionization energies. This means that they are relatively easy to remove an electron from, making them reactive. Additionally, the elements in the second period have relatively low melting points and boiling points, which also makes them reactive.
