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What complete family of chemical did mendeleev leave out of his periodic table?
Mendeleev left out the noble gases (Group 18) from his periodic table because they were not discovered yet at the time he developed the table. These elements were later added to the periodic table as they were discovered.
Which element was discovered after the original table was developed?
One element that was discovered after the original periodic table was developed is gallium. It was identified in 1875 by French chemist Paul Emile Lecoq de Boisbaudran, well after Dmitri Mendeleev created the first periodic table in 1869. Gallium's discovery confirmed the predictions made by Mendeleev regarding the existence of undiscovered elements in his periodic table.
Who developed industrial alloys and synthetics.?
Dmitri Mendeleev
Why Francium is not in Mendeleev Periodic Table?
Francium was discovered in 1939, several decades after Mendeleev created his periodic table in 1869. At the time Mendeleev developed his table, francium had not yet been identified, and elements were organized based on their known properties and atomic weights. Additionally, francium is a highly radioactive and unstable element, which made it difficult to study and include in early classifications of elements.
When Mendeleev developed the first periodic table there were approximately how many elements known?
By 1869, a total of 63 elements had been discovered.
What complete family of chemical did mendeleev leave out of his periodic table?
Mendeleev left out the noble gases (Group 18) from his periodic table because they were not discovered yet at the time he developed the table. These elements were later added to the periodic table as they were discovered.
Who developed the first periodic table?
Dmitri MendeleevDmitri Mendeleev
Which element was discovered after the original table was developed?
One element that was discovered after the original periodic table was developed is gallium. It was identified in 1875 by French chemist Paul Emile Lecoq de Boisbaudran, well after Dmitri Mendeleev created the first periodic table in 1869. Gallium's discovery confirmed the predictions made by Mendeleev regarding the existence of undiscovered elements in his periodic table.
Who developed industrial alloys and synthetics.?
Dmitri Mendeleev
Why Francium is not in Mendeleev Periodic Table?
Francium was discovered in 1939, several decades after Mendeleev created his periodic table in 1869. At the time Mendeleev developed his table, francium had not yet been identified, and elements were organized based on their known properties and atomic weights. Additionally, francium is a highly radioactive and unstable element, which made it difficult to study and include in early classifications of elements.
Who developed the first workable periodic table?
Dmitri Mendeleev in 1869
Who developed the periodic law?
Dmitri Mendeleev, a Russian chemist, was the first.
When Mendeleev developed the first periodic table there were approximately how many elements known?
By 1869, a total of 63 elements had been discovered.
What was Dmitri Mendeleev's accomplishments?
In 1869, he published the greatest of his works, Principles of Chemistry, where he formulated his famous periodic table, translated into many languages ​​and that was a textbook for many years.
Which scientists developed the first periodic table?
Dmitrij Mendelejev in 1869.
Why was mendeleev unable to make any predictions about the noble gas elements?
The reason that Mendeleev didn't make any predictions about the gases was that these gases were not even discovered yet, therefore it was impossible for Mendeleev to make predictions.----Dmitri Mendeleev made his predictions on what would fill the gaps on his far from perfect periodic table. He predicted their sizes, weights, appearances, etc.I think the reason he didn't make predictions is because noble gases are not visible, and weightless.-------------------------------Mendeleev couldn't predict the noble gases' properties because their existence wasn't known, as implied above.Argon, a noble gas, was noticed twenty-five years later by John William Strutt and Sir William Ramsey (the names are not really important).It doesn't matter that the elements weren't discovered. That's the whole point of arranging the elements. To PREDICT the properties of the missing/unknown ones.
What elements did Dmitri mendeleev discover?
In 1869, a total of 63 elements had been discovered by. A few were gases. Two were liquids. Most were solid metals.
