Modern Periodic Table | Chemistry Class 10 #3 | Summary and Q&A

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February 18, 2020
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Modern Periodic Table | Chemistry Class 10 #3

TL;DR

The modern periodic table organizes elements based on their atomic number, overcoming limitations of the previous periodic table.

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Questions & Answers

Q: What is the basis of the modern periodic table?

The modern periodic table is based on the concept that the properties of elements are a periodic function of their atomic numbers.

Q: How does the modern periodic table handle the position of isotopes?

The modern periodic table places isotopes in the same position since they have the same atomic number, unlike the previous periodic table based on atomic mass.

Q: How does the modern periodic table resolve the position of cobalt and nickel?

The modern periodic table places cobalt after nickel because cobalt has an atomic number of 27 and nickel has an atomic number of 28, providing a clear sequence based on atomic number.

Q: What determines the position of hydrogen in the modern periodic table?

Hydrogen is placed in Group 1 and Period 1 of the modern periodic table due to its atomic number of 1 and one valence electron.

Summary & Key Takeaways

  • Henry Moseley introduced the modern periodic law, which states that the periodic properties of elements are a function of their atomic numbers rather than atomic masses.

  • The modern periodic table overcame limitations such as the position of isotopes, the position of cobalt and nickel, and the position of hydrogen.

  • The modern periodic table does not allow for elements with decimal atomic numbers between whole numbers, resolving the possibility of new elements in between existing ones.

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