Write the advantages of Mendeleev's periodic table.
OR
Write the characteristics of the modern periodic table
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Answer:
Characteristics of Modern periodic table
The elements are arranged based on their increasing atomic number.
There are 7 periods and 18 groups in the table.
The inert gases i.e. He, Ne, Ar, etc. are kept in 0 at the extreme right side of the table.
All the groups are divided into sub groups A and B except 0 and VIII group in the modern periodic table.
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Explanation:
Advantages of Mendeleev's periodic table:-
- Mendeleev was the first one to establish a systematic arrangement and bring out the periodicity of properties of elements with atomic weight and propose a periodic law.
- It could point out the incorrect atomic weight of some elements known at that time.
- It could predict the existence of other elements and could predict their properties so, as to leave space in the periodic table.
- It could accommodate all the sixty elements discovered at that time and could accommodate the noble gases which, where discovered later.
Characteristics of the modern periodic table
- The long form of periodic table consist of vertical columns called groups and horizontal rows called periods.
- Elements are arranged in the increasing order of atomic numbers.
- Elements in the modern periodic table are arranged in 7 periods and 18 groups.
- Horizontal rows are called periods and vertical columns are called groups.
- Elements are placed in periods based on the number of shells in their atoms.
- The shortest period is the first period which contains only two elements – Hydrogen and Helium.
- The second period contains elements from Lithium to Neon.
- The third period contains elements from Sodium to Argon.
- The fourth period contains elements from Potassium to Krypton.
- The fifth period contains elements from Rubidium to Xenon.
- Sixth period is considered as the longest periods in the periodic table. It contains elements from Cesium to Radon
- Seventh period is incomplete period
- In group IIIB of the sixth period Lanthanides are placed.
- In group IIIB of the seventh period Actinides are placed
- In periodic table Lanthanides and Actinides are shown in the bottom of the periodic table.
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