Susana SimÃµes Pereira, maths teacher and PhD in science teaching and communication. I enjoy games and photography and I'm passionate for science and art, specially when together in the same context. You can follow my updates on Twitter, LinkedIn and Facebook.
The periodical organization of the chemical elements was not always as we know it today. In fact it was had several changes, as a result of the contribution of many researchers. The criteria for the organization, the number of elements and their designations constitute some of the changes that can be identified.
Below you can find some contributions, check them out: