HARD
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Which one (atom / ion) in the following pairs has higher electron gain enthalpy?
Important Questions on Classification of Elements and Periodicity in Properties
EASY
The absolute value of the electron gain enthalpy of halogens satisfies:
MEDIUM
Which of the following reactions does not involve absorption of energy?
I.
II.
III.
IV.
MEDIUM
The first electron affinity of and will be of the order
EASY
What is the correct oder of electron gain enthalpy of
EASY
The first ionization enthalpies of and follow the order
MEDIUM
The correct order of first electron affinity of and is
EASY
Which of the following elements has the most negative electron gain enthalpy?
EASY
The formation of the oxide ion, , from oxygen atom requires first an exothermic and then an endothermic step as shown in below:
Thus process of formation of in gas phase is unfavourable though is isoelectronic with neon. It is due to the fact that,
EASY
When the first electron gain enthalpy of oxygen is , its second electron gain enthalpy is:
EASY
The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na + will be :
HARD
In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?
(A) and
(B) and
(C) and
(D) and
Choose the correct answer from the options given below:
EASY
The correct order of atomic radii is:
MEDIUM
For electron gain enthalpies of the elements denoted as , the incorrect option is :
MEDIUM
Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements?
a. Nitrogen
b. Phosphorous
c. Chlorine
d. Fluorine
MEDIUM
The difference between electron gain enthalpies will be maximum between :
EASY
For and , the correct order of increasing ionic radii is:
EASY
The correct order of atomic radii in group elements is
EASY
Within each pair of elements and , and , and and , respectively, the elements that release more energy upon an electron gain are
EASY
The species and contain the same number of electrons. In which order do their radii increase?
EASY
Identify the element that forms amphoteric oxide:
