Trends In Atomic Size Of 3d Series Elements - D and F Block Elements - Chemistry Class 12

TL;DR

The atomic size of the 3d series elements decreases from scandium to zinc, except for an unexpected decrease in size between manganese and zinc.

Transcript

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Key Insights

• 🫀 The atomic size of the 3d series elements generally decreases from scandium to zinc.
• 🫀 An unexpected decrease in atomic size is observed between manganese and zinc.
• 🖐️ The filling of electrons and the shielding effect play a role in determining atomic size.
• 🫀 The opposing nature of the shielding effect and nuclear charge affects the trend in atomic size.
• 🫀 The atomic size of an element can be influenced by the balance between the shielding effect and the nuclear charge.
• 🚫 The filling of electrons in the d-block results in the last electron entering the 3d orbital.
• ❓ Scandium has one electron in the 3d orbital, while other elements have more electrons in the 3d orbital.

Questions & Answers

Q: Why does the atomic size of the 3d series elements generally decrease from scandium to zinc?

The filling of electrons and the shielding effect of the extra electrons entering the d orbital cause the atomic size to decrease across the period.

Q: Why is there an unexpected decrease in atomic size between manganese and zinc?

The opposing nature of the shielding effect and nuclear charge causes the atomic size to remain almost unchanged between manganese and zinc.

Q: What is the role of the shielding effect in determining atomic size?

The shielding effect, caused by the extra electrons entering the d orbital, opposes the attraction of the nucleus to the outermost electron, resulting in a larger atomic size.

Q: How does the trend in atomic size of the 3d series elements relate to the concept of shielding effect?

The trend in atomic size is influenced by the balance between the shielding effect and the nuclear charge, which affects the attraction of the nucleus to the outermost electron.

Summary & Key Takeaways

• The atomic size of the 3d series elements generally decreases from scandium to zinc, but there is an anomaly between manganese and zinc.

• The filling of electrons in the d-block and the shielding effect of the extra electrons entering the d orbital play a role in determining atomic size.

• The opposing nature of the shielding effect and nuclear charge affects the trend in atomic size.