Mendeleev was able to predict the properties of the elements that were not discovered at that time. He left gaps for these elements in his Periodic Table.
Mendeleev was able to predict the properties of the elements that were not discovered at that time. He left gaps for these elements in his Periodic Table.
Mendeleev periodic table was able to predict the properties of new elements which were discovered later on.
Yes
He could not because it had not yet been discovered when he created the table. However he was able to determine that an element was missing at that location and predict the properties it would have when it was discovered. When germanium was discovered and named, his predictions were found to be very accurate.
they are different
They are different
Well it is partly true. Helium has physical properties like density, boiling point, conductivity etc. But it has no chemical property.
yes. We use it to help preserve things like ham, bacon sausage and most other cured meats. At first, this was thought to be a wonderful way to reduce the risk of botulism. As time went on however, scientists discovered that the very ionic properties hat prevent the growth of bacteria also cause cancer.
Mendeleev left gaps for undiscovered elements. He predicted their properties which were found to be accurate later.
True.
He could not because it had not yet been discovered when he created the table. However he was able to determine that an element was missing at that location and predict the properties it would have when it was discovered. When germanium was discovered and named, his predictions were found to be very accurate.
they are different
In 1619 tessellations was studied and discovered and in 1891 it was proven to be correct and accurate.
They are different
http://encarta.msn.com/encyclopedia_761562418/Helium.html
743 and a half :) 743 and a half :)
Thermometers and accurate measurements and data keeping prove that the earth is warming.
Shape, dimensions, mass, colour.
Mendeleev had some empty spaces in his table. On being asked why he left spaces, instead of seeing it as a drawback, he confidently said that those were the places for "yet to be discovered elements". He named them by prefixing the Sanskrit numeral "Eka-" to the preceding element.For example, he named Gallium as "Eka-aluminium", Germanium as "Eka-Silicon" and so on. Later, when a new element was found and was named as Gallium, it was observed that it had almost same properties as that of Eka-Aluminium predicted by Mendeleev. As his predictions were almost accurate, other scientists began to accept that his classification was indeed better than any others'. And so, it was accepted.
varies with temp. in a reproducible way, rapid response , accurate