Mendeleev's periodic table
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Explainer Video
Summary
Mendeleev's periodic table
In a nutshell
Dmitri Mendeleev made one of the first periodic tables in the 19th century. He did this by arranging elements from lightest to heaviest and according to their properties. The modern periodic table is based on his ideas.
Mendeleev periodic table
Mendeleev wrote down the names of the elements to help him identify patterns. The elements were ordered from lightest to heaviest and arranged in groups based on physical and chemical properties. Interestingly, Mendeleev left gaps in the periodic table for elements that had not been discovered yet.
Example
Germanium was undiscovered in Mendeleev's time but once identified it had a place in the periodic table, as Mendeleev left a gap for it.
Modern periodic table
The modern periodic table is largely based on the following ideas of Mendeleev's:
- Elements are arranged in order of increasing atomic numbers
- Columns are called groups
- Elements in the same group have similar properties
- Rows are called periods
FAQs - Frequently Asked Questions
What ideas of Mendeleev were used for the modern periodic table?
The modern periodic table is largely based on Mendeleev's ideas that elements are arranged in order of increasing atomic numbers. The rows in the periodic table are called periods. Whereas, the columns are called groups. Elements in the same group have similar properties.
How were the elements in the periodic table ordered by Mendeleev?
The elements in the periodic table were ordered from the lightest to heaviest and arranged in groups based on physical and chemical properties by Mendeleev.
Who was Mendeleev?
Dmitri Mendeleev made one of the first periodic tables in the 19th century.