d and f BLOCK ELEMENTS

What is the primary focus of the section discussing actinoid properties in the provided text?

• Their use in nuclear reactors.
• Their radioactive decay modes.
• Their discovery history.
• Reactivity, magnetism, ionization, and comparison with lanthanoids.

Which acid's effect on actinoids is contrasted with its effect on many other metals?

• Sulfuric acid
• Hydrochloric acid
• Acetic acid
• Nitric acid

What is the significance of the statement that outer electrons in actinoids are 'available for bonding'?

• It indicates low density.
• It explains their chemical reactivity.
• It means they are noble gases.
• It relates to their magnetic properties.

How does the text describe the similarities among early actinoid elements?

• They are completely different.
• They show large differences.
• They show close similarities with each other.
• They are identical to lanthanoids.

What general property of actinoids allows them to react with boiling water?

• Low melting point.
• High inherent reactivity.
• Low density.
• Paramagnetic nature.