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Questions and Answers
What does the atomic number of an atom represent?
What does the atomic number of an atom represent?
How are elements organized on the periodic table?
How are elements organized on the periodic table?
What is the basis for the atomic mass of an element?
What is the basis for the atomic mass of an element?
How was the first version of the periodic table organized?
How was the first version of the periodic table organized?
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What is the role of protons in determining the atomic number?
What is the role of protons in determining the atomic number?
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Who confirmed the existence of protons?
Who confirmed the existence of protons?
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How is the modern periodic table arranged?
How is the modern periodic table arranged?
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What defines the identity of an atom?
What defines the identity of an atom?
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What changes during nuclear decay?
What changes during nuclear decay?
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What stays the same for ions?
What stays the same for ions?
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Study Notes
- Mendeleev's periodic table was published in 1869.
- English researcher Henry Moseley confirmed the existence of protons in the early 20th century.
- Atomic number is the number of protons in an atom, defining its identity.
- Nuclear decay can result in a change of atomic number, as seen in Uranium-238 becoming Thorium-234.
- Modern periodic table is arranged by atomic number.
- Atomic symbols are abbreviated and may have subscripts and superscripts indicating mass and atomic number.
- Neutral atoms have equal number of protons and electrons, while ions do not.
- Atomic number remains the same for ions, with symbols indicated by a charge symbol as a superscript.
- Isotopes have the same atomic number but different mass numbers due to different neutron counts.
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Description
Test your knowledge about atomic numbers, which represent the number of protons in an atom's nucleus. Learn about the unique atomic numbers of elements on the periodic table and their significance in defining an element's properties.
