PART- II CHEMISTRY
SECTION- A
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: The first ionisation enthalpy decreases across a period.
Reason R: The increasing nuclear charge outweighs the shielding across the period.
In the light of the above statements, choose the most appropriate from the options given below:
and 
are true and 
is the correct explanation of 
is true but 
is false
is true
and 
are true but 
is NOT the correct explanation of 
Text Solution
Verified by ExpertsC
First ionisation energy increases along the period. Along the period 
increases which outweighs the shielding effect
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