Development of the Periodic Table

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Questions and Answers

Who arranged the elements in order of increasing atomic number?

Lothar Meyer
Dmitri Mendeleev
Henry Moseley (correct)
John Newlands

Dmitri Mendeleev created the law of octaves.

False (B)

What did John Newlands notice about the properties of elements?

He noticed the repetition of the properties every eight elements.

Henry Moseley arranged elements based on their unique number of __________.

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Match the following scientists with their contributions:

<p>John Newlands = Created the law of octaves Lothar Meyer = Demonstrated connection between atomic mass and properties Dmitri Mendeleev = Predicted existence of undiscovered elements Henry Moseley = Arranged elements by atomic number</p> Signup and view all the answers

Flashcards

Newlands' Law of Octaves

John Newlands arranged elements by increasing atomic mass and noticed that the properties repeated every eight elements, leading to his Law of Octaves.

Lothar Meyer's Work

Lothar Meyer found a relationship between the atomic mass of an element and its properties. He arranged elements in order of increasing atomic mass.

Mendeleev's Periodic Table

Dmitri Mendeleev recognized a connection between atomic mass and element properties. He arranged elements in order of increasing atomic mass and used this to predict the properties of undiscovered elements.

Moseley's Atomic Number

Henry Moseley discovered that each atom has a unique number of protons called the atomic number. By arranging elements in order of increasing atomic number, he revealed a more accurate periodic pattern of properties.

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Periodic Law

The principle that the properties of elements are periodic functions of their atomic numbers. Elements with similar properties appear at regular intervals in the periodic table.

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Study Notes

Early Periodic Table Development

John Newlands organized elements by increasing atomic mass, noticing repeating properties every eight elements. This was known as the law of octaves.

Lothar Meyer and Dmitri Mendeleev

Lothar Meyer and Dmitri Mendeleev independently recognized a relationship between atomic mass and element properties.
Both arranged elements in order of increasing atomic mass.

Mendeleev's Key Contribution

Mendeleev predicted the existence and properties of undiscovered elements based on gaps in his table.

Henry Moseley's Crucial Advancement

Henry Moseley discovered that each atom has a unique number of protons, termed the atomic number.
Moseley's arrangement of elements by increasing atomic number revealed a clear periodic pattern of properties, improving on earlier models that focused on atomic mass.

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Description

Explore the history and evolution of the periodic table, from John Newlands' law of octaves to Mendeleev's predictions and Moseley's atomic number. This quiz covers key contributions and significant scientists who shaped modern chemistry. Test your knowledge on the foundational developments of this essential scientific tool.