(D) The correct answer is $(D)$.Across a period from left to right,the effective nuclear charge increases while the number of shells remains the same.

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Size of the atoms increases for normal elements

(D) The correct answer is $(D)$.Across a period from left to right,the effective nuclear charge increases while the number of shells remains the same.This leads to a stronger attraction between the nucleus and the valence electrons,causing the atomic size to decrease,not increase.Therefore,the statement that the size of atoms increases is incorrect.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Mix Examples - Classification of Elements and Periodicity in Properties

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Point out the wrong statement: On moving horizontally from left to right across a period in the periodic table

A
Metallic character decreases
B
Electronegativity increases
C
Gram atomic volume first decreases and then increases
D
Size of the atoms increases for normal elements

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Class 11 Questions

Class 11

Chemistry Questions

Chapter

Classification of Elements and Periodicity in Properties

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Mix Examples - Classification of Elements and Periodicity in Properties

Among the elements $B$,$Al$,$C$,and $Si$,
$(a)$ which element has the highest first ionisation enthalpy?
$(b)$ which element has the most metallic character? Justify your answer in each case.

Medium

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Which of the following statements is incorrect?

Medium

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Choose the correct statement.

Medium

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The electronic configurations of four elements are:
$I. [Xe] \, 6s^1$
$II. [Xe] \, 4f^{14} \, 5d^1 \, 6s^2$
$III. [Ar] \, 4s^2 \, 4p^5$
$IV. [Ar] \, 3d^7 \, 4s^2$
Select the incorrect statement about these elements.

Difficult

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Explain the following:
$(a)$ Electronegativity of elements increases on moving from left to right in the periodic table.
$(b)$ Ionisation enthalpy decreases in a group from top to bottom.

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Point out the wrong statement: On moving horizontally from left to right across a period in the periodic table

Similar Questions

Among the elements $B$,$Al$,$C$,and $Si$,$(a)$ which element has the highest first ionisation enthalpy?$(b)$ which element has the most metallic character? Justify your answer in each case.

Which of the following statements is incorrect?

Choose the correct statement.

The electronic configurations of four elements are:$I. [Xe] \, 6s^1$$II. [Xe] \, 4f^{14} \, 5d^1 \, 6s^2$$III. [Ar] \, 4s^2 \, 4p^5$$IV. [Ar] \, 3d^7 \, 4s^2$Select the incorrect statement about these elements.

Explain the following:$(a)$ Electronegativity of elements increases on moving from left to right in the periodic table.$(b)$ Ionisation enthalpy decreases in a group from top to bottom.

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Among the elements $B$,$Al$,$C$,and $Si$,
$(a)$ which element has the highest first ionisation enthalpy?
$(b)$ which element has the most metallic character? Justify your answer in each case.

The electronic configurations of four elements are:
$I. [Xe] \, 6s^1$
$II. [Xe] \, 4f^{14} \, 5d^1 \, 6s^2$
$III. [Ar] \, 4s^2 \, 4p^5$
$IV. [Ar] \, 3d^7 \, 4s^2$
Select the incorrect statement about these elements.

Explain the following:
$(a)$ Electronegativity of elements increases on moving from left to right in the periodic table.
$(b)$ Ionisation enthalpy decreases in a group from top to bottom.