Q30 of 31 Page 198

How the position of elements in the periodic table helps you predict its chemical properties? Explain with an example.

Position of elements in the periodic table gives a prediction of:


i. Ionization energy of the element.


ii. Electron affinity of the element


iii. Metallic and non-metallic properties.


iv. Electronegativity


For example: An element having atomic number = 9


Its group number is 2 and period number is 2.


This means the element belongs to non-metals.


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How do you appreciate the role of electronic configuration of the atoms of elements in periodic classification?

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Without knowing the electronic configuration of the atoms of elements Mendeleff still could arrange the element nearly close to the arrangements in the Modern periodic table. How can you appreciate this?

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Comment on the position of hydrogen in periodic table.