(C) The electronic configuration is $2, 8, 8, 2$. The number of valence electrons is $2$,so it belongs to group $II$ and period $4$. The atomic number

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The formula of its oxide is $MO_2$.

(C) The electronic configuration is $2, 8, 8, 2$. The number of valence electrons is $2$,so it belongs to group $II$ and period $4$. The atomic number $Z = 2 + 8 + 8 + 2 = 20$. The number of neutrons = $\text{Atomic weight} - Z = 40 - 20 = 20$. Since the valency of the element $(M)$ is $2$ and oxygen has a valency of $2$,the formula of its oxide is $MO$. Therefore,the statement that the formula of its oxide is $MO_2$ is incorrect.

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

Medium

An element of atomic weight $40$ has $2, 8, 8, 2$ as the electronic configuration. Which one of the following statements regarding this element is not correct?

A
It belongs to $II$ group of the periodic table.
B
It has $20$ neutrons.
C
The formula of its oxide is $MO_2$.
D
It belongs to $4^{th}$ period of the periodic table.

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Classification of Elements and Periodicity in Properties

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Mix Examples - Classification of Elements and Periodicity in Properties

Which of the following statements is incorrect?

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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Which of the following statement$(s)$ is/are correct?

Difficult

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

Easy

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

MediumJEE MAIN 2019

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An element of atomic weight $40$ has $2, 8, 8, 2$ as the electronic configuration. Which one of the following statements regarding this element is not correct?

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Which of the following statements is incorrect?

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.

Which of the following statement$(s)$ is/are correct?

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

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

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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.