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Chapter 4: Problem 47

What trends were first used to classify the elements? What trends were discovered after the elements were classified in the periodic table?

Short Answer

Expert verified
The elements were initially classified based on atomic weight and chemical similarities. After classification, new trends discovered included the prediction of properties of undiscovered elements, reclassification by atomic number, and trends in atomic radius, ionization energy, electron affinity and electronegativity.

Step by step solution

01

Original Classification Trends

The elements were first classified based on their atomic weight or atomic mass and their chemical similarities. Dmitri Mendeleev is credited with the first widely recognized version of the periodic table in 1869. He arranged elements in order of increasing atomic weight and grouped the elements which had similar properties. This was possible because of the periodic repetition of their properties, hence the name 'Periodic Table'.
02

Discoveries after Classification in the Periodic Table

After the classification of elements in the periodic table, several trends were discovered. One was the prediction of properties of undiscovered elements using the periodic law. Also, once the structure of the atom was better understood, elements were reclassified based on atomic number rather than atomic weight. This yielded the modern periodic table. Trends in atomic radius, ionization energy, electron affinity and electronegativity across the periods and groups were also discovered.

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Most popular questions from this chapter

What property do the noble gases share? How do the electron configurations of the noble gases give them this shared property?

Which group of elements has very high ionization energies and very low electron affinities?

How was Moseley's arrangement of the elements in the periodic table different from Mendeleev's?

In his periodic table, Mendeleev placed Be, Mg, Zn, and Cd in one group and Ca, Sr, Ba, and Pb in another group. Examine the electron configurations of these elements, and explain why Mendeleev grouped the elements this way.

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