What are Isobars?

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Isobars are atoms of different elements with the same mass number but different atomic numbers. The electronic configurations of isobars are different from each other.

Examples of Isobars

An example of isobars include –

Argon (Ar₁₈⁴⁰)
Potassium (K₁₉⁴⁰)
Calcium (Ca₂₀⁴⁰)

In these isobars, the atomic number of the 3 elements are 18, 19, and 20. While all these atoms have the same mass number i.e. 40.

So they have the same mass number but different atomic numbers and electronic configurations, hence they are isobars.

Isobars

Electronic Configuration for Isobars

The electronic configuration of these isobars is –

Calcium – ⁴⁰₂₀Ca – 2,8,8,2
Argon – ⁴⁰₁₈Ar – 2,8,8

As the number of electrons in these isobars is different, hence they have distinct electronic configurations.

Properties of Isobars

Isobars have different chemical properties due to a difference in the number of electrons in their shells.

An additional number of neutrons balances the difference in the number of nucleons.
Another example of Isobars is iron and nickel.
Both of the elements have 58 as the mass number.
The atomic number of iron and nickel is 26 and 28 respectively.

Read more:

Related Concepts
Metals and Non Metals	Carbon & its Compounds	Chemical Reactions and Equations
What is a molecule?	Intermolecular Forces	Alpha particle mass
Difference between elements and compounds	Spectral Series	Bohr Radius

CBSE CLASS XII Related Questions

1.
(i) Why do Zr and Hf exhibit similar properties ?
(ii) "\( E^\circ \) for \( \mathrm{Mn^{3+}/Mn^{2+}} \) couple is more positive than that for \( \mathrm{Fe^{3+}/Fe^{2+}} \)." Justify the statement.
[Atomic number : Mn = 25, Fe = 26]

View Solution

2.
An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it:
(I) does not give Tollen's test but gives a positive iodoform test.
(II) does not give Tollen's test and iodoform test but undergoes Aldol condensation.
(III) undergoes Cannizzaro's reaction.

View Solution

3.
Draw the structures of major monohalo products in each of the following :
(a)
(b)

View Solution

4.
The chelating ligand used for the treatment of lead poisoning is :

Ethane-1,2-diamine
Oxalate ion
Dimethylglyoxime
EDTA

View Solution

5.
Explain the Finkelstein reaction.

View Solution

6.
(i) Give a chemical test to distinguish between Propanal and Propanone.
(ii) Which of the given acids is stronger and why ? \( \mathrm{F_3C{-}C_6H_4{-}COOH} \) or \( \mathrm{H_3C{-}C_6H_4{-}COOH} \)
(iii) Complete the given reaction sequence :
\[ \mathrm{CH_3CH_2CH_2COOC_2H_5} \xrightarrow{\mathrm{NaOH}} \mathrm{A + C_2H_5OH} \]
\[ \mathrm{A} \xrightarrow{\mathrm{H_3O^+}} \mathrm{B} \]

View Solution

What are Isobars?

Examples of Isobars

Electronic Configuration for Isobars

Properties of Isobars

CBSE CLASS XII Related Questions

1.
(i) Why do Zr and Hf exhibit similar properties ?
(ii) "\( E^\circ \) for \( \mathrm{Mn^{3+}/Mn^{2+}} \) couple is more positive than that for \( \mathrm{Fe^{3+}/Fe^{2+}} \)." Justify the statement.
[Atomic number : Mn = 25, Fe = 26]

2.
An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it:
(I) does not give Tollen's test but gives a positive iodoform test.
(II) does not give Tollen's test and iodoform test but undergoes Aldol condensation.
(III) undergoes Cannizzaro's reaction.

3.
Draw the structures of major monohalo products in each of the following :
(a)
(b)

4.
The chelating ligand used for the treatment of lead poisoning is :

5.
Explain the Finkelstein reaction.

Comments

SUBSCRIBE TO OUR NEWS LETTER

What are Isobars?

Examples of Isobars

Electronic Configuration for Isobars

Properties of Isobars

CBSE CLASS XII Related Questions

1.(i) Why do Zr and Hf exhibit similar properties ?(ii) "\( E^\circ \) for \( \mathrm{Mn^{3+}/Mn^{2+}} \) couple is more positive than that for \( \mathrm{Fe^{3+}/Fe^{2+}} \)." Justify the statement.[Atomic number : Mn = 25, Fe = 26]

2.An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it: (I) does not give Tollen's test but gives a positive iodoform test. (II) does not give Tollen's test and iodoform test but undergoes Aldol condensation. (III) undergoes Cannizzaro's reaction.

3.Draw the structures of major monohalo products in each of the following :(a)(b)

4.The chelating ligand used for the treatment of lead poisoning is :

5.Explain the Finkelstein reaction.

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
(i) Why do Zr and Hf exhibit similar properties ?
(ii) "\( E^\circ \) for \( \mathrm{Mn^{3+}/Mn^{2+}} \) couple is more positive than that for \( \mathrm{Fe^{3+}/Fe^{2+}} \)." Justify the statement.
[Atomic number : Mn = 25, Fe = 26]

2.
An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it:
(I) does not give Tollen's test but gives a positive iodoform test.
(II) does not give Tollen's test and iodoform test but undergoes Aldol condensation.
(III) undergoes Cannizzaro's reaction.

3.
Draw the structures of major monohalo products in each of the following :
(a)
(b)

4.
The chelating ligand used for the treatment of lead poisoning is :

5.
Explain the Finkelstein reaction.