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Classification of Elements and Periodicity in Properties
Ionsiation enthalpy of fluorine is greater than that of oxygen. Explain.
Ionsiation enthalpy of fluorine is greater than oxygen, it is primarily due to:
(i) the increase in nuclear charge and,
(ii) decrease in atomic size of fluorine. Due to the combined effect of these two factors, the force of attraction between the nucleus and electron to be removed increases. Hence ionisation enthalpy increases.
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Give the ‘liquid elements’ in the periodic table.
What is valency of an element?
Gallium was named by Mendeleev as
What are magic numbers?
Which property is the basis of long form of periodic table?
How many elements are placed in each period of the p-block?
What is the number of groups in: (i) p-block (ii) d-block?
How many elements are present in:
(i) second period
(ii) fourth period
(iii) sixth period?
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