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What prediction did Mendeleev make that came true less then 20 yrs later?
Wiki User
∙ 11y ago
he predicted the places where he knew elements should be but he couldn't visibly see. Back when Mendeleev was alive, what you could not see you could not measure. This explains why he couldn't see the noble gasses.
Wiki User
∙ 11y ago
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How is the modern periodic table different from Dmitri mendeleev's table?
The only important difference is that the modern periodic law must be framed in terms of atomic numbers, where Mendeleev framed the original periodic law in terms of atomic weights. There are only three places where this makes a difference. For cobalt and nickel Mendeleev assigned both exactly the same atomic weight -- well within the error margins at the time. For tellurium and iodine, Mendeleev insisted, wrongly, that the recognised atomic weight of tellurium was wrong, and that it had to be less than that of iodine. And the third case did not come up until later, because argon was not discovered until 1894 (element number 18, argon, has an atomic weight greater than that of element 19, potassium).
Who was the first person to publish a periodic table?
The person credited with making the first periodic table is Dmitri Mendeleev, published officially in 1869. However, he only created the first periodic table similar to the one we use today. Alexandre-Emile Béguyer de Chancourtois was the first person to see the similarities between groups of elements. He made the earliest attempt at a kind of table to sort the elements. This table was called the Vis Tellurque, or the Telluric Helix, and it was published in 1863. Lothar Meyer, a German chemist, had also been working on a table, unknown to Dmitri. However, Lothar's table only included 28 elements. Although he published his work in 1864, you will find very few historians that will tell you that he made the first table, since his was so incomplete at the time. Since you are looking for the first person to PUBLISH a table, the best answer would be Alexandre, but the other two would probably work just as well.
What property did Mendeleev use to primarily the elements into a periodic table?
The basic organization structure was by atomic mass, which while it may follow a trend of increasing with each progressing element on the modern table, which is organized by atomic number or number of protons, there are a few exceptions, such as Argon having a greater atomic mass than Potassium, even though Argon has one less proton.
How did Dmitri Mendeleev arrange the elements in the periodic table?
Mendeleev ordered the elements from lowest atomic mass unit (amu) to highest atomic mass unit.
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What prediction did Mendeleev make that came true less than 20 years?
He said that te three new elements would be discovered, and he described their properties.
How is the modern periodic table different from Dmitri mendeleev's table?
The only important difference is that the modern periodic law must be framed in terms of atomic numbers, where Mendeleev framed the original periodic law in terms of atomic weights. There are only three places where this makes a difference. For cobalt and nickel Mendeleev assigned both exactly the same atomic weight -- well within the error margins at the time. For tellurium and iodine, Mendeleev insisted, wrongly, that the recognised atomic weight of tellurium was wrong, and that it had to be less than that of iodine. And the third case did not come up until later, because argon was not discovered until 1894 (element number 18, argon, has an atomic weight greater than that of element 19, potassium).
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Initially 9.8 meters per second square. Later, as air resistance increases, the acceleration will be less and less.Initially 9.8 meters per second square. Later, as air resistance increases, the acceleration will be less and less.Initially 9.8 meters per second square. Later, as air resistance increases, the acceleration will be less and less.Initially 9.8 meters per second square. Later, as air resistance increases, the acceleration will be less and less.
How could you test a prediction?
This is a process wherein a forecast of events is based on observation. Predictions can reliable only when there is regularity in the changes observed. Predictions are also safe if the variables can be controlled or if there are less variables that can possibly affect predictions. One can predict what is to happen at a certain time when predictions are based on observations and past experience. Predictions, therefore, can be within or beyond observed events.Interpolation is a prediction made based on observed data, while extrapolation is a forecast beyond observed data.
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It is too soon to tell. Though they were brothers Fidel Castro and his brother have different philosophies about government. A prediction is that his brother is less stringent and less of a dictator. We shall know within the next few months.
How the ancient civilizations came up with the notion of a month using the orbit of the moon?
It probably came quite naturally, because the Moon (a) is easy to see, and (b) has a more or less regular period.It probably came quite naturally, because the Moon (a) is easy to see, and (b) has a more or less regular period.It probably came quite naturally, because the Moon (a) is easy to see, and (b) has a more or less regular period.It probably came quite naturally, because the Moon (a) is easy to see, and (b) has a more or less regular period.
Mendeleev's decision to leave gaps in his perodic table was supported by the discovery of?
Yes; in his time not every element was known. As every element in the same column (group) has more or less the same chemical properties, he predicted there should be an element that was not yet discovered at some places. For example, under Silicon, there was a gap where he suspected that, to complete the pattern, a new element was missing; he called it eka-silicon, and correctly predicted many of its properties. The new element was found later, with properties very similar to the predictions; it was eventually called Germanium.
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the destruction of Nagasaki
