Here's how he did it:
* Periodic Law: Mendeleev observed that elements with similar properties appeared at regular intervals when arranged by atomic weight. He realized that atomic weight wasn't the sole factor determining an element's properties, and there were some discrepancies in the known atomic weights that didn't fit his table.
* Adjustments: To make the periodic table work, Mendeleev made adjustments to the atomic weights of some elements. He did this by:
* Switching the order of elements: For example, he switched the positions of tellurium (Te) and iodine (I) in the table.
* Leaving gaps: He left spaces in his table for elements that hadn't yet been discovered. He predicted their properties based on the position they would occupy.
Elements Whose Atomic Masses Were Adjusted:
It's difficult to pinpoint the exact elements whose atomic masses were adjusted, as Mendeleev didn't provide a definitive list. However, some of the elements that were likely to have been affected by his adjustments include:
* Beryllium (Be)
* Indium (In)
* Tellurium (Te)
* Uranium (U)
It's important to note:
* Mendeleev's adjustments were based on his understanding of the periodic law and the properties of known elements. They weren't corrections in the modern sense, but rather estimations based on his observations.
* Modern methods for determining atomic mass are much more precise than those available to Mendeleev, and we now know that his adjustments were sometimes incorrect.
Mendeleev's work was groundbreaking in its time and laid the foundation for the modern periodic table. His adjustments to atomic masses were a key part of his approach to creating a coherent and predictive system for classifying elements.
