Practice question

MCQ

Question

What is the effect of lanthanoid contraction on the atomic sizes of post-lanthanoid elements?

Options

Choose one · Correct answer highlighted

Increases their sizes No effect Makes 4d and 5d elements similar in size Correct Decreases their densities

Explanation

Lanthanoid contraction causes similar atomic sizes of 4d and 5d transition elements.

Share this question

Discussion

Comments

0 comments

Please log in to join the discussion.

No comments yet. Be the first to start the discussion.

Related blogs

Guides and insights connected to this topic

Class IX Science 14 Sep 2026

Journey Inside the Atom Notes - Atomic Structure, Bohr Model and Electronic Configuration

Explore the fundamentals of atoms, from ancient ideas to Dalton's theory, Bohr's model, and electronic configuration in clear notes.

Class X Science 12 Sep 2026

Periodic Classification of Elements Notes - Dobereiner Triads, Newlands Octaves, Mendeleev and Modern Periodic Table

Explore early attempts to classify elements, covering Dobereiner’s triads, Newlands’ law of octaves and Mendeleev’s table with examples and key details.

Immunology 16 May 2023

Innate vs. Acquired Immunity

What is the Immune system? The immune system is the complex network of organs, cells, and proteins that protects the body against infections...