Monthly archives: March, 2015

9 Class Science- Periodic Table of Elements Part 2

Periodic Properties of the Elements Periodic properties are the properties of the elements which depend on their electronic configuration and these properties changes on moving down in the group and on moving left to right in the period of the periodic table. Some periodic properties are atomic size, electron affinity, ionization energy, metallic and non …

9 Class Science- Periodic Table of Elements Part 1

Periodic Table of Elements More than 115 elements have been discovered which need to be arranged systematically, first elements were classified as metals and non metals. History of classification of elements 1.     Prout’s Hypothesis – 1815 2.     Dobereiner’s Triads – 1829 3.     Newland’s Law of Octaves – 1863 4.     Lother Meyer Curves – 1869 5.     …