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d- and f-Block Elements — Flashcards

ICSE · Class 12 · Chemistry

45 flashcards for d- and f-Block Elements (ICSE Class 12 Chemistry) to test yourself on key terms and facts. Sample: "What are transition elements?"

60 questions45 flashcards5 concepts

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An infographic showing the trend in the nature of oxides (basic, amphoteric, acidic, neutral) across a period in the periodic table, with examples.
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45 Flashcards·
Definition of transition elementsDefinition of inner transition elementsPosition in periodic tableTransition seriesExceptional electronic configurationTransition element definitionElectronic configuration
Card 1Definition of transition elements

What are transition elements?

Answer

Transition elements are those elements in which the differentiating electron enters the (n-1)d subshell. They belong to groups 3 to 12 of the periodic table.

Card 2Definition of inner transition elements

What are inner transition elements?

Answer

Inner transition elements are those elements in which the differentiating electron enters the (n-2)f subshell. They form the lanthanoid and actinoid series placed separately at the bottom of the perio…

Card 3Position in periodic table

Why are d-block elements called transition elements?

Answer

They lie between the highly electropositive s-block elements and the electronegative p-block elements, so they show transitional behaviour between ionic and covalent character.

Card 4Transition series

Write the first transition series, second transition series, third transition series, and fourth transition series.

Answer

First transition series: Sc to Zn. Second transition series: Y to Cd. Third transition series: La and Hf to Hg. Fourth transition series: Ac and elements with atomic number 104 and above.

Card 5Exceptional electronic configuration

Why is chromium an exception in electronic configuration?

Answer

Chromium has [Ar] 3d5 4s1 instead of the expected [Ar] 3d4 4s2. Half-filled and completely filled subshells are extra stable, so one 4s electron shifts to 3d to give a more stable arrangement.

Card 6Exceptional electronic configuration

Why is copper an exception in electronic configuration?

Answer

Copper has [Ar] 3d10 4s1 instead of the expected [Ar] 3d9 4s2. One 4s electron shifts to 3d to give a completely filled d subshell, which is extra stable.

Card 7Transition element definition

Why are Zn, Cd, and Hg not true transition elements?

Answer

Zn, Cd, and Hg do not have partially filled d orbitals in their atoms or in their common ions. Zn and Zn2+ are 3d10, Cd and Cd2+ are 4d10, and Hg and Hg2+ are 5d10.

Card 8Electronic configuration

What is the general electronic configuration of transition elements?

Answer

The general electronic configuration is (n-1)d1-10 ns1-2.

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Frequently Asked Questions

What are the important topics in d- and f-Block Elements for ICSE Class 12 Chemistry?
Key topics in d- and f-Block Elements include Position, Definition, and Classification, Electronic Configuration and Exceptional Cases, Atomic Size, Ionic Size, Density, and Metallic Nature, Ionisation Enthalpy, Oxidation States, and Electrode Potentials. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many flashcards are available for d- and f-Block Elements?
There are 45 flashcards for d- and f-Block Elements covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise d- and f-Block Elements for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 60 practice questions on d- and f-Block Elements. Revise definitions regularly and use flashcards for quick recall before the exam.

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