Compare the chemical reactivity of actinoids with lanthanoids.

Solution

Actinoids are far more reactive than lanthanoids especially in the powdered form. They react with non-metals at moderate temperatures whereas lanthanoids needs high temperature.
They are not affected by nitric acid as protective oxide layer prevents their further reaction. They do not react with alkalies. With water they form both oxides and hydrides whereas lanthanoids form hydroxide and H₂ gas.

$Ln + H_{2} O \overset{∆}{\to} Ln (OH)_{3} + H_{2} Ac + H_{2} O \to {Ac}_{2} O_{3} + {AcH}_{3}$

Some More Questions From The d-And-f-Block Elements Chapter

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The D-And-f-Block Elements

Compare the chemical reactivity of actinoids with lanthanoids.

Some More Questions From The d-And-f-Block Elements Chapter

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Why are transition elements known as d-block elements?

Write the general electronic configuration of d-block elements.

Why do some exceptions to the general electronic configuration of d-block elements exists?

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For Daily Free Study Material Join wiredfaculty

The D-And-f-Block Elements

Compare the chemical reactivity of actinoids with lanthanoids.

Some More Questions From The d-And-f-Block Elements Chapter

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Why are transition elements known as d-block elements?

Write the general electronic configuration of d-block elements.

Why do some exceptions to the general electronic configuration of d-block elements exists?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?