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Questions and Answers
Who arranged the elements in order of increasing atomic number?
Who arranged the elements in order of increasing atomic number?
Dmitri Mendeleev created the law of octaves.
Dmitri Mendeleev created the law of octaves.
False
What did John Newlands notice about the properties of elements?
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 __________.
Henry Moseley arranged elements based on their unique number of __________.
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Match the following scientists with their contributions:
Match the following scientists with their contributions:
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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.
