Answer the following question.
1-What was the periodic law given by Mendeleev?
2-What are the main features of Mendeleev's periodic table?
3-How did Mendeleev construct his periodic table?
4-Why did Mendeleev leave gaps in the periodic table?
5-Draw the Mendeleev arrangement of elements in 1871.
Solved the answer given the question and send home work group.
Answers
ANSWER:
1. Mendeleev proposed his own periodic law that when the elements are arranged in order to increase atomic mass, certain sets of properties recur periodically.
2.Mendeleev arranged the elements in horizontal rows (known as periods) in the increasing order of their atomic masses. Each vertical column (called groups) contained elements of similar properties. The main features of Mendeleev's periodic table are: Groups and sub-groups: There are eight groups (I to VIII).
3. Mendeleev arranged the elements in order of increasing relative atomic mass . When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend .
4.Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements. ... The element germanium was discovered later.
5. The above picture is for answer number (5.)
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