d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge

Question 101

▼

What is a significant reason for the greater variability in oxidation states observed in Actinoids compared to Lanthanoids?

Actinoids have more electrons.
Actinoids are radioactive.
The 5f, 6d, and 7s orbital energies are more similar in Actinoids than the 4f, 5d, and 6s orbital energies are in Lanthanoids.
Actinoids are heavier.

▼

What is the most common oxidation state for Uranium (U)?

▼

What is the most common oxidation state for Thorium (Th)?

▼

What is the most common oxidation state for Actinium (Ac)?

▼

Why is the +2 oxidation state particularly stable for Europium (Eu) and Ytterbium (Yb)?

Because they have fewer protons.
Because they are lighter elements.
Because Eu2+ has a half-filled f-subshell (4f7) and Yb2+ has a fully-filled f-subshell (4f14).
Because they are radioactive.