How did Mendeleev and Moseley contribute to the periodic table?
Mendeleev and Moseley are credited with being most responsible for the modern periodic law: When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties. The result is the periodic table as we know it today.
What did Moseley do to Mendeleev’s?
When Moseley arranged the elements in the periodic table by their number of protons rather than their atomic weights, the flaws in the periodic table that had been making scientists uncomfortable for decades simply disappeared.
What was the difference between Mendeleev’s periodic table and Moseley’s periodic table find two elements that would be in different places on each table?
The major difference between the periodic table created by Dmitri Mendeleev and the one created by Henry Moseley is that: Moseley arranged the elements in order of increasing atomic number. Mendeleev ordered his components so as of their relative atomic mass, and this gave him some issues.
Who Solved Dmitri Mendeleev’s periodic table?
Alfred Werner
In 1905, Swiss chemist Alfred Werner resolved the dead zone of Mendeleev’s table. He determined that the rare-earth elements (lanthanides), 13 of which were known, lay within that gap.
What group is missing from Mendeleev’s periodic table?
Noble Gases
The group missing from Mendeleev’s periodic table was the Noble Gases (group 8A/18). Since these gases do not react very well, they are difficult to detect and were not known in Mendeleev’s time.
What is the similarities between Mendeleev and modern periodic table?
Similarities between Mendeleev’s periodic and Modern periodic table: Elements are arranged in groups and periods. Elements with similar properties are placed in the same group. Metals and non-metals are placed separately.
What are the drawbacks of Mendeleev periodic table?
Demerits of Mendeleev Periodic Table
- He was unable to locate hydrogen in the periodic table.
- Increase in atomic mass was not regular while moving from one element to another.
- Later on, isotopes of elements were found which violated Mendeleev’s periodic law.
