Periodic classification of elements class 10

periodic classification of elements
Every new discovery starts with curiosity. It begins with innovation. And the initial steps taken for the same are the ones that become the foundation for the end product! Even designing of the Periodic table started with few scientists realising the need for classifying elements, for easy study. And one of the pioneers in the process are the two scientists named Dobereiner and Newland, who put forth the Dobereiner's Triad and Newland's Octaves. And what are these?