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Ionisation Energy

how to predic...

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how to predict the position of element in periodic table on the basis ofsuccessive ionisation energy?

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Q. Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.

Q. Following table shows the successive molar ionisation energy (kJ mol

- 1

) of five elements A to E.

Element	Ionisation energy (kJ mol $^{- 1}$ )
Element	1st	2nd	3rd	4th
A	2080	4000	6100	9400
B	500	4600	6900	9500
C	740	1500	7700	10500
D	580	1800	2700	11600
E	420	3100	4400	5900

Which two elements are most likely to be in the same group of the periodic table?

On the basis of their position in the periodic table, maximum metallic character is present in which element :

Q. How the positions of elements in the periodic table help you to predict its chemical properties? Explain with an example.

Q. Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.

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