Changes

:[[Dimitri Mendeleev]] was a [[Russian]] [[chemist]] who put together the [[periodic table]] which is still used today.  He not only put it together, but he accounted for gaps in which [[elements]] that were not discovered yet would go, he went even further when he predicted the properties of these [[elements]] using the periodic law.  An example of this was Mendeleev’s new [[element]], ekaaluminum (Ea), which is what we know as [[gallium]] (Ga) today:  his predicted [[atomic mass]] was 69, the actual [[atomic mass]] is 69.7.  His predicted [[density]] was 6.0 g/cm³, the actual [[density]] is 5.9 g/cm³.  I am amazed at the accuracy of these predictions, and in honor of his contributions, they named an [[element]] after him: [[Mendelevium]] (Md).  (Jonathan R.)

:[[Dimitri Mendeleev]] was a [[Russian]] [[chemist]] who put together the [[periodic table]] which is still used today.  He not only put it together, but he accounted for gaps in which [[elements]] that were not discovered yet would go, he went even further when he predicted the properties of these [[elements]] using the periodic law.  An example of this was Mendeleev’s new [[element]], ekaaluminum (Ea), which is what we know as [[gallium]] (Ga) today:  his predicted [[atomic mass]] was 69, the actual [[atomic mass]] is 69.7.  His predicted [[density]] was 6.0 g/cm³, the actual [[density]] is 5.9 g/cm³.  I am amazed at the accuracy of these predictions, and in honor of his contributions, they named an [[element]] after him: [[Mendelevium]] (Md).  (Jonathan R.)