He most probably predicted it. He could have analyzed the table and could have thought there are a lot more elements out there. He probably thought the scientist in his generation did not know all of the elements.
How was Dmitri Mendeleev able to predict the properties of unknown elements? because he was a lazy
because he was the only one smart back then
By classification in groups
Mainly all elements in a group have same properties..
Or may be he was a f****** genius O.o
Mendeleev left gaps for non- existing elements at that time. He predicted their properties according to their position in periodic table.
If I knew I wouldn't be asking!
Dmitri Mendeleev was a Russian inventor and chemist. He is perhaps best known for his version of the periodic table. This helped him predict properties of elements which had not yet been discovered at that time.
If the elements (which were discovered by his time) were organized in the increasing order of their atomic weight, they will exhibit an apparent periodicity of properties. It also had the ability to predict physical and chemical properties of some undiscovered elements.
Dmitri Mendeleev is generally credited, as he was able to predict the properties of elements which had not yet been discovered based on 'gaps' in his table. He ordered the known elements in terms of their atomic mass in 1869; elements are listed in order of increasing atomic number in the modern version.
Comparing the properties of the new element with the properties of the other elements in the group we can make this prediction.
This is a very wordy response, but by setting up the Periodic Table according to elements' properties and characteristics, he was able to predict any given elements' properties because, with the way the Periodic Table is arranged, all of the elements surrounding any specific element would have similar properties to the element that they surrounded. For example, at the time there was no element known as Aluminum, but given the properties of the elements around that area (Group 13), he was able to correctly predict Aluminum's properties. When aluminum was discovered, Mendeleev's predictions were extremely close to the actual element's properties.
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.
He used the difference method
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Mendeleev left gaps for undiscovered elements. He predicted their properties which were found to be accurate later.
because,he predicted some possible chemical formulas of the then undiscovered elements between the elements in his periodic table. so he concluded that more elements with specific properties would be discovered.
Mendeleev did not predict the properties of silicon.
He was able to work out the atomic mass of the missing elements, and so predict their properties. And when they were discovered, Mendeleev turned out to be right. For example, he predicted the properties of an undiscovered element that should fit below aluminium in his table. When this element, called gallium, was discovered in 1875, its properties were found to be close to Mendeleev's predictions. Two other predicted elements were later discovered, lending further credit to Mendeleev's table.
It's probably Mendeleev you're after. He came up with the first version of a Periodic Table of the elements, and used this to predict the properties of elements that hadn't been discovered at that time.
Independently by Dmitri Mendeleev and Lothar Meyer in 1869
the large gaps
the large gaps
Dmitri Mendeleev