0
Yes.
In 1817, J. W. Dobereiner pointed out that there were sets of three elements (Triads) which showed similar chemical properties. He also noticed the fact that the atomic weight of the central element of the Triad approximately is the mean of the atomic weights of the other two members. The properties of the middle element were in between those of the end members. He could identify only three triads from the elements known at that time. Hence this method of classification was discarded.
Debereiner triads were:
Li, Na, K
Ca, Sr, Ba
Cl, Br, I
What else can I help you with?
One of the important ideas about Mendeleev's periodic table was that he predicted new?
One of the important ideas about Mendeleev's periodic table was that he predicted new elements and their properties before they were discovered. This demonstrated the predictive power and organization of the periodic table, which was a significant advancement in the field of chemistry.
Who drew the first periodic table?
Dmitri Mendeleev is credited with creating the first periodic table of elements in 1869. He organized the elements based on their properties and atomic weights, allowing for the prediction of undiscovered elements.
How is the table of elements you prepared similar to the modern periodic table?
Yes, modern day periodic table was based off of Mendeleev's. The difference is that the modern day periodic table is arranged by atomic number, and Mendeleev's was arranged by atomic mass.
How did mendeleev place arsenic and selenium?
Mendeleev placed arsenic before selenium in his periodic table based on their atomic weights and chemical properties. Arsenic has a lower atomic weight and exhibits similar chemical behavior to other elements in its group, making it a better match for the position before selenium.
Who preceded Mendeleev and Meyer with work on the periodic table?
Antoine Lavoisier and Johann Wolfgang Döbereiner made contributions to the development of the periodic table before Mendeleev and Meyer. Lavoisier proposed a classification system based on properties of elements, and Döbereiner developed the concept of triads, which grouped elements with similar properties.
When did chlorine get placed in the periodic table?
1806 was the date of first recognition of chlorine as an element. Chlorine was placed in all of the first three attempts at periodic classification -- Newlands in 1864, Mendeleev and Lothar Meyer in 1869. There was really no such thing as a 'periodic table' before 1869.
Who proposed and device the periodic table?
Mendeleev. Many others contributed ideas before bu Mendeleev's contribution is considered the most important.
Why were the elements gallium scandium and germanium important to Medeleev?
Mendeleev used the properties of gallium, scandium, and germanium to predict their existence before they were discovered. Their discovery and properties helped confirm the accuracy of Mendeleev's periodic table and his periodic law. This further solidified Mendeleev's contributions to the development of the modern periodic table.
Who is the most recent creator of the periodic table?
The most recent creator of the periodic table was Dmitri Mendeleev in 1869. He is credited with developing the original version of the periodic table that organized elements based on their properties and atomic weights.
One of the important ideas about Mendeleev's periodic table was that he predicted new?
One of the important ideas about Mendeleev's periodic table was that he predicted new elements and their properties before they were discovered. This demonstrated the predictive power and organization of the periodic table, which was a significant advancement in the field of chemistry.
What did Mendeleevs periodic table look like?
It looks the same as it did when Mendeleev created it. There are no changes made to the table throughout the years because Mendeleev had predicted the correct placement for all of our current known elements.
What is the correct chronological order of scientists contributing to the modern periodic table?
Dmitri Mendeleev was the first to develop the modern periodic table in 1869. Later, Henry Moseley rearranged the elements by atomic number, which is the modern arrangement. So, Mendeleev comes before Moseley in terms of their contributions to the modern periodic table.
Who drew the first periodic table?
Dmitri Mendeleev is credited with creating the first periodic table of elements in 1869. He organized the elements based on their properties and atomic weights, allowing for the prediction of undiscovered elements.
Which two elements in the fourth period violate the original periodic law as stated by Mendeleev?
Cobalt and nickel. They were placed before expected elements based on increasing atomic mass due to their similar chemical properties, violating Mendeleev's original periodic law.
Why did mendeleev leave blank spaces on his periodic table?
Mendeleev left blank spaces because certain elements on the Periodic Table were not known at that time. He knew that in the future, those elements would be found and placed on the periodic table.
Who discovered the periodic table of element?
Dmitri Mendeleev, although he did it differently we than it is right now. He pridected elements, and now, they've been discovered. Some people discovered elements Mendeleev didn't predict. Most of them were radioactive, like rutherfordium. (Of course, that element was synthetic. There are only 92 natural elements.) Mendeleev used different symbols than we do now, e.g. yttrium was Yt. The elements Mendeleev predicted were gallium, germanium, and scandium.
Was there been more than one periodic table?
Yes, there have been several versions of the periodic table developed over time. The current version is based on Dmitri Mendeleev's layout, which arranges elements by their atomic number and chemical properties. Different scientists have made adjustments and improvements to the periodic table as new elements have been discovered.
