Periodic table is one of the most important way to know about any primary element of the world. It has become a very important way for the Chemists who dedicate their life in discovering more about the elements of World. At this moment periodic table is a must for those who are interested in in Chemistry. It has a long history
of it's development. At first It was Laviosea who divided all the elements into three groups in his time.After that in 1864 English scientist John A. R. New-lands found the similarity of every 8th element by their Atomic Mass. In 1869 Dmitri I. Mendeleev and German scientist J. Lothario Meyer made a chart classifying the similarity of the elements. Which was called Periodic table from then. But it has changed through all these years. Now Scientists are having problem with Lawrencium (Lr - 103 no. element). It is 103 number element of periodic table. So it is in the actinides series. But the problem begins with The characteristic of it is very similar with the characteristic of Sodium (Na - 11 no. element) and Potassium (K - 19 no. element). Though Sodium and Potassium are in the 1st group Lawrencium is in the actinium series. If we follow the similarity of the elements we must put it in the 3rd group after Scandium (Sc - 21 no. element) and Yttrium (Y - 39 no. element). Many chemist think that Lutetium(Lu - 71 no. element) and Lawrencium shouldn't be in the F block ,it should be in the D block and the Lanthanum and the Actinium series should be in the 1st place of F block. There is so much talking about this matter. The scientists have came into a very hard position to think about this problem. So it is a matter to think about that should the periodic table be unchanged.
of it's development. At first It was Laviosea who divided all the elements into three groups in his time.After that in 1864 English scientist John A. R. New-lands found the similarity of every 8th element by their Atomic Mass. In 1869 Dmitri I. Mendeleev and German scientist J. Lothario Meyer made a chart classifying the similarity of the elements. Which was called Periodic table from then. But it has changed through all these years. Now Scientists are having problem with Lawrencium (Lr - 103 no. element). It is 103 number element of periodic table. So it is in the actinides series. But the problem begins with The characteristic of it is very similar with the characteristic of Sodium (Na - 11 no. element) and Potassium (K - 19 no. element). Though Sodium and Potassium are in the 1st group Lawrencium is in the actinium series. If we follow the similarity of the elements we must put it in the 3rd group after Scandium (Sc - 21 no. element) and Yttrium (Y - 39 no. element). Many chemist think that Lutetium(Lu - 71 no. element) and Lawrencium shouldn't be in the F block ,it should be in the D block and the Lanthanum and the Actinium series should be in the 1st place of F block. There is so much talking about this matter. The scientists have came into a very hard position to think about this problem. So it is a matter to think about that should the periodic table be unchanged.
good thinking
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