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Questions and Answers
What was the total number of elements in Mendeleev's periodic table?
Who is known for leaving empty cells in the periodic table for future elements?
How many main groups did Mendeleev classify the elements into?
Which scientist discovered that the nucleus contains positively charged protons?
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What is the term for the elements that occupy the middle block (d) in the periodic table?
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Study Notes
Mendeleev's Periodic Table
- Mendeleev's periodic table had 67 elements.
- Mendeleev left spaces in his table, which were later filled with discovered elements.
The Atom's Nucleus
- The nucleus of an atom contains positively charged protons.
- Rutherford discovered the nucleus of the atom contains positively charged protons.
Energy Levels of the Atom
- The heaviest known atom has 7 energy levels.
- Bohr discovered the main energy levels of the atom.
Modern Periodic Table
- The modern periodic table contains 118 elements.
- 92 elements exist naturally.
- The modern periodic table has 7 periods.
- The modern periodic table has 18 groups.
- The modern periodic table has 4 blocks: s, p, d, and f.
Transition Elements
- Elements in the d block are called transition elements.
- Transition elements appear in the third period.
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Description
This quiz covers key concepts related to the periodic table, including Mendeleev's contributions, the structure of the atom, energy levels, and transition elements. Test your knowledge on the organization and properties of elements as understood in modern chemistry.
