HARD
11th CBSE
IMPORTANT
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Generally, the first ionisation energy increases along a period. But, there are some exceptions. One which is not an exception is
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Important Questions on Classification of Elements and Periodicity in Properties
HARD
11th CBSE
IMPORTANT
The correct decreasing order of first ionisation enthalpies of five elements of the second period is
HARD
11th CBSE
IMPORTANT
Which of the followings represents the correct order of increasing first ionisation enthalpy for and ?
HARD
11th CBSE
IMPORTANT
Screening effect is not observed in
HARD
11th CBSE
IMPORTANT
In which case, effective nuclear charge is minimum?
HARD
11th CBSE
IMPORTANT
The effective nuclear charge of an element with three valence electrons is . What is the atomic number of the element?
HARD
11th CBSE
IMPORTANT
Which of the following configuration represents atoms of the element having the highest second ionisation potential?
HARD
11th CBSE
IMPORTANT
Which electronic configuration of an element has abnormally high difference between second and third ionisation energy ?
HARD
11th CBSE
IMPORTANT
The five successive ionisation energies of an element are and respectively. The number of valence electrons is
