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They used atomic number instead of Atomic Mass to organize the elements
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Why is mendeleevs periodic table a model?
Mendeleev's periodic table is considered a model because it organizes elements based on their atomic mass and chemical properties, highlighting periodic trends and relationships among them. This arrangement allowed Mendeleev to predict the existence and properties of undiscovered elements, demonstrating the table's utility in understanding elemental behavior. Additionally, the structure of the table reflects the periodic law, which states that the properties of elements are a periodic function of their atomic mass. Thus, it serves as a foundational framework for modern chemistry, despite later modifications based on atomic number.
What makes up the halogen triad?
This refers to an old "history of science " topic around the work done prior to mendeleevs on Periodic Table. Elements were put in triads with similar properties. The halogen triad was chlorine, bromine and iodine. Pretty useless idea long term but a good start for people who came later.
How did the chemists change mendeleevs periodic table?
Well.... one of the many changes that were made to the periodic table was its appearance. It was coloured in in order for people to recognise the different groups. Red for Group 1, orange for Group 2 etc... Hope this helps. Jeremy Eric Slazkowski, Des Moines, Iowa The Periodic Table was first constructed around 1870 when the Russian chemist Dmitry Mendeleyev catalogued all of the known elements. The elements were arranged according to their similarities. More recently discovered elements were added, and the order of elements became based on their atomic numbers. The modern periodic table has much of the same information as the original one by Mendeleyev, but is arranged somewhat like a chart with elements having similar properties falling into columns called groups or families.
What elements add later to the periodic table?
germanium
Which energy source has been developed and improved by chemists?
One energy source that has been developed and improved by chemists is solar energy. Chemists have worked on improving the efficiency of solar cells, developing new materials for capturing and converting sunlight into electricity, and finding ways to store solar energy for later use.
When did Meyer contribute the periodic table?
Meyer developed a table that was similar to modern periodic table. But his work was published later after Mendeleev.
How did mendellev design the periodic table?
Mendeleev designed the periodic table by increasing atomic mass. But it was later changed to increasing atomic number.
What happens to someone with periodic paralysis?
A person with periodic paralysis experiences sudden onset of weakness, which gradually subsides, only to return again later.
What is the Halogen Triad?
This refers to an old "history of science " topic around the work done prior to mendeleevs on periodic table. Elements were put in triads with similar properties. The halogen triad was chlorine, bromine and iodine. Pretty useless idea long term but a good start for people who came later.
Why was leaving spaces and gaps in the periodic table later vindicated?
Leaving spaces and gaps in the periodic table allowed for prediction of new elements and their properties, which were later discovered and filled in. This vindicated the decision to leave gaps, as it demonstrated the power of the periodic table in organizing and predicting the properties of elements.
How many elements did Mendeleevs original periodic table have?
In 1863 56 known elements were discovered. Mendeleev's first attempt*) resulted in 9 elements in three rows (periods) and three groups (-1, +1, +2 valence groups):Cl - K - CaBr -Rb -SrI - Cs - Ba*) cit. from wikipedia :"I saw in a dream a table where all elements fell into place as required. Awakening, I immediately wrote it down on a piece of paper, only in one place did a correction later seem necessary."- - - - Mendeleev 1869, as quoted by Inostrantzev.
What was true about the elements that would later be put in those gaps?
When Mendeleev proposed his periodic table, he noted gaps in the table, and ... Initial versions of the periodic table did not give the rare earth elements the ... that these atomic elements would be discovered, that he included them in later.
