yr7_Medvedev

= =  Dimitri Ivanovich Mendeleev (Дми́трий Ива́нович Менделе́ев ) Hello,        My name is Ditiri Ivanovich Mendeleev, and I did a very inportant discovery: I made the periodic table. You may think :`` But what is a periodic table?`` Well it is a normal table showing all the elements existing,        I grouped them by their atomic weight. So it works like this, the elements are arrenged in rows called periods. The atomic number goes up as you move across, it starts with alkali metals and it goes to the right: hydrogen,alkali metals,        alkaline-earth metals, transiton metals, lanthanides and actinides ( witch were discovered later on ), poor metals, semi metals, non-metals and noble gasses at the end. So any way, im not just famous because I did the periodic table but because I predicted that there where going to be discovered some elements in the future that where not discoverd yet ,not only predicted but knew what were the propeties going to be. The three ones that were discovered in my lifetime proved me right. media type="youtube" key="CdkpoQk2LDE&hl=en&fs=1" height="344" width="425"