Podcast
Questions and Answers
Who was the first person to classify the elements?
Who was the first person to classify the elements?
Dmitri Mendeleev
What is the definition of the Periodic Table?
What is the definition of the Periodic Table?
Arrangement of elements by atomic number
What property was used by Mendeleev to organize the elements?
What property was used by Mendeleev to organize the elements?
Atomic mass
Name one element that was predicted by Mendeleev and later discovered.
Name one element that was predicted by Mendeleev and later discovered.
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What group of elements was discovered after Mendeleev's table was created?
What group of elements was discovered after Mendeleev's table was created?
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What was the first noble gas discovered?
What was the first noble gas discovered?
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Which noble gas was discovered by William Ramsay?
Which noble gas was discovered by William Ramsay?
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Who arranged the elements by atomic number?
Who arranged the elements by atomic number?
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What is the atomic number?
What is the atomic number?
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What are valence electrons?
What are valence electrons?
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What determines the periods on the periodic table?
What determines the periods on the periodic table?
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What are the electron sublevels?
What are the electron sublevels?
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Which of the following are considered main group elements?
Which of the following are considered main group elements?
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What does the group number of a main group element indicate?
What does the group number of a main group element indicate?
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What is the electron configuration?
What is the electron configuration?
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What are sublevels?
What are sublevels?
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How many elements are found naturally occurring on Earth?
How many elements are found naturally occurring on Earth?
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What was Moseley's contribution to the periodic table?
What was Moseley's contribution to the periodic table?
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How are elements organized vertically on the periodic table?
How are elements organized vertically on the periodic table?
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How are elements organized horizontally on the periodic table?
How are elements organized horizontally on the periodic table?
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Study Notes
Dmitri Mendeleev
- First organized elements in 1869.
Periodic Table
- Arranges elements by atomic number.
Atomic Mass
- Used by Mendeleev to classify elements.
Gallium
- Predicted by Mendeleev and later discovered.
Germanium
- Predicted by Mendeleev and later discovered.
Scandium
- Predicted by Mendeleev and later discovered.
Noble Gases
- Group discovered after Mendeleev's table.
Argon
- First noble gas discovered in 1894.
Krypton
- Discovered by William Ramsay in 1895.
Xenon
- Discovered by William Ramsay in 1895.
Neon
- Discovered by William Ramsay in 1895.
Henry Moseley
- Organized elements by atomic number (1911).
Periodic Law
- Properties of elements depend on atomic number.
Atomic Number
- Number of protons in an atom's nucleus.
Valence Electrons
- Electrons in the outermost energy level.
Principle Energy Levels
- Energy levels that dictate element periods.
Electron Sublevels
- s, p, d, and f blocks in the periodic table.
Main Group Elements
- Groups 1, 2, and 13-18.
Group Number
- Indicates the number of valence electrons.
Electron Configuration
- Arrangement of electrons in atomic orbitals.
Sublevels
- Areas where electrons are found.
Naturally Occurring Elements
- 92 elements found in nature.
Moseley's Contribution
- Improved the periodic table using atomic number.
Groups
- Elements organized vertically.
Periods
- Elements organized horizontally.
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Description
Test your knowledge on Dmitri Mendeleev's contributions to the periodic table and the properties of elements. This quiz covers key concepts such as atomic mass, atomic number, and the discovery of noble gases. Dive deep into the historical and scientific significance of the periodic law!
