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The ionisation energy of alkali metals d...

The ionisation energy of alkali metals decreases from Li to Cs bacause

A

the atomic size increases from Li to Cs

B

The sitance betweenn nucleus and outermost orbital decreases from Li to Cs

C

electropositive character decreases down the group

D

melting point decreases from Li to Cs.

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A
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NCERT FINGERTIPS-THE S-BLOCK ELEMENTS-Assertion And Reason
  1. The ionisation energy of alkali metals decreases from Li to Cs bacause

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  2. Assertion: Elements of group 1 are called 'alkali metals'. Reason: A...

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  3. Assertion: Lithium resembles magnesium diagonally placed in next group...

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  4. Assertion: Alkali metals are obtained by electrolysis of molten salt a...

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  5. Assertion: Lithium salts are mostly hydrated. Reason: The hydration ...

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  6. Assertion: The melting and boiling points of the alkali metals are low...

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  7. Assertion: Lithium fluoride is most covalent in nature. Reason: Smal...

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  8. Assertion: The carbonate of lithium decomposes easily on heating. Re...

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  9. Assertion : Super-oxides of alkali metals are para-magnetic. Reason ...

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  10. Assertion: Be and Mg do not impat characteristic colour to the flame. ...

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  11. Assertion: The fluorides of alkaline earth metals are relatively less ...

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  12. Assertion: Be is readily attacked by acids. Reason: Be shows diagona...

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  13. Assertion: Alkaline earth metal oxides are quite stable to heat. Rea...

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  14. Assertion: BeSO(4) and MgSO(4) are insoluble in water. Reason: Be^(2...

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  15. Assertion: CaCO(3) is prepared by passing carbon dioxide gas through s...

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  16. Assertion: For biological functions in human body, barium is not requi...

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