Question

List the characteristics of Modern Periodic table.. In detail... ​

Answer 1

The characteristics of 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

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• 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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Answer 2

Answer:

1. i the modern periodic table the classification of elements is based on the atomic number which is the more fundamental property of elements
2. this classification os based on the atomic number and not on the atomic mass the position of placing the isotopes at onc place is fully justified
3. the electronic configuration of the elements determine their properties the postion of the elements in the periodic table is given according to the electronic configuration
4. to remember and reproduce the atomic number is easy and convenient
5. the study of the elements became more simple by the systematic grouping of elements into four blocks i.e. S P D and F Block
6. some of the elements were misfit in the periodic table on the basis of atomic mass now their positions are justified on the basis of atomic number e.g. argon (18) is placed before potassium (19)
7. the lanthanides and actinides are placed separately at the bottom of the periodic table having different properties and it is easier to study these two series separately
8. metals non metals and metalloids are clearly demarked
9. the comparison of the properties of the elements based on atomic number become more easy
10. this classification gives clear information of the number of electrons in various shells

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