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Chapter 8: Problem 2

What is Moseley's contribution to the modern periodic table?

Short Answer

Expert verified
Moseley contributed to the formation of the modern periodic table by ordering elements based on their atomic numbers rather than atomic mass, which is reflective of the number of protons in the nucleus.

Step by step solution

01

Understanding Moseley's contribution

Henry G. J. Moseley, a British physicist, made a key contribution to the periodic table. His work revolved around observing the element's atomic number rather than atomic mass.
02

X-Rays and Atomic Numbers

Moseley studied X-rays and discovered that every element's atomic number was equal to the number of protons present in the nucleus. He devised a method of ordering the elements based on their atomic numbers.
03

Modern Periodic Table

The recognition of the concept of atomic number and the organization of elements based on it has resulted in the formation of the modern periodic table that we use today. This is Moseley's major contribution.

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Most popular questions from this chapter

For each pair of elements listed, give three properties that show their chemical similarity: (a) sodium and potassium, (b) chlorine and bromine.

Why do elements that have high ionization energies also have more positive electron affinities? Which group of elements would be an exception to this generalization?

In general, atomic radius and ionization energy have opposite periodic trends. Why?

The \(\mathrm{H}^{-}\) ion and the \(\mathrm{He}\) atom have two \(1 s\) electrons each. Which of the two species is larger? Explain.

Use the third period of the periodic table as an example to illustrate the change in first ionization energies of the elements as we move from left to right. Explain the trend.
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