Periodic table is a arrangement of elements. Before discovering the modern periodic table, chemists discovered some patterns seen in elements. According to these patterns such as reactivity, physical nature etc. attempts were made to arrange elements. Mendaleev was the first scientist who published the first periodic table. As many elements were not discovered by then there were gaps in the periodic table published by Mendaleev.
Periodic table consists of Periods - horizontal raws -marked as 1,2,3...
Groups- vertical raws- marked as I, II, III...
Mainly divided in to blocks as s, p, d, f
Periodic table is very useful to predict and categorize elements
Proton number has been used to arrange the modern periodic table.
Next about Periodic Trends
