When the first electron gain enthalpy ( ΔH eg ) of oxygen is - 141 kJ / mol , its second electron gain enthalpy is:

Almost the same as that of the first

Negative, but less negative than the first

A more negative value than the first

In general, the properties that decrease and increase down a group in the periodic table, respectively, are :

Electronegativity and atomic radius

Atomic radius and electronegativity

Electronegativity and electron gain enthalpy

Electron gain enthalpy and electronegativity

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Assertion : Electron affinity values of the $3^{rd}$ period elements on extreme right of the periodic table except noble gases are generally more than the $2^{nd}$ period element of the same group.
Reason : Due to smaller atomic size of the $2^{nd}$ period element, its electron density increases which oppose the addition of electron.

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Important Questions on Classification of Elements and Periodicity in Properties

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 3>Q 3

Assertion: Nitrogen (atomic number

7

) has less electron affinity than the oxygen (atomic number

8

).
Reason: The magnitude of an element's electron affinity only depends on the element's valence shell electrons configuration.

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 3>Q 4

Assertion: Second electron gain enthalpy of halogens is always positive.
Reason: Fluorine has maximum value of electron gain enthalpy.

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 3>Q 6

Assertion : The atomic radii of the elements of the oxygen family are smaller than the atomic radii of the corresponding elements of the nitrogen family.
Reason : The members of the oxygen family are more electronegative and thus have lower values of nuclear charge than those of the nitrogen family.

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 3>Q 7

Assertion: Fluorine has a less negative electron gain enthalpy than chlorine.
Reason: There is relative greater effectiveness of

2 p -

electrons in the small

F

atom to repel the additional electron entering the atom than to

3 p -

electrons in the larger

Cl

atom.

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 3>Q 8

Assertion:

Li

and

Mg

shows diagonal relationship.
Reason:

Li

and

Mg

are diagonal to each other in the periodic table

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 1

Assertion: First ionisation energy for nitrogen is lower than oxygen.
Reason: Across a period effective nuclear charge decreases.

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 2

Consider the following statements:
I. The radius of an anion is larger than that of the parent atom.
II. The ionization energy generally increases with increasing the atomic number in a period.
III. The electronegativity of an element is the tendency of an isolated atom to attract an electron. Which of the above statements is/are correct?

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 3

Which of the order for ionization energy is correct?

Important Questions on Classification of Elements and Periodicity in Properties

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