d and f BLOCK ELEMENTS

What are iron and steels primarily used for according to the text?

• Electrical components
• Jewelry
• Construction materials
• Food packaging

Which industry uses MnO2 according to the text?

• Pigment industry
• Dry battery cells
• Steel production
• Catalyst industry

Why is the chemistry of elements succeeding actinoids less known?

• Because they are all stable.
• Because they are naturally abundant.
• It is not explicitly stated in the provided text.
• Because they only exhibit one oxidation state.

Which element is mentioned as a well-known lanthanoid exhibiting +4 oxidation state?

• Europium
• Ytterbium
• Lanthanum
• Cerium

Which contraction has more extended effects on the properties of succeeding elements currently?

• Actinoid contraction
• Lanthanoid contraction
• Both are equally important.
• Neither has significant effects.