d and f BLOCK ELEMENTS Quiz

• They are all noble gases.
• They are naturally abundant and stable.
• Their synthetic nature and short half-lives make study difficult.
• They only exist in outer space.

• They are chemically inert.
• They have higher melting points.
• They have lower ionization enthalpies and higher reactivity.
• They behave exactly like lanthanoids.

• Actinoid contraction is always larger.
• Lanthanoid contraction is more important due to better-known chemistry of subsequent elements.
• Both are equally important.
• Actinoid contraction only affects actinoids.

• 4f electrons are more available for bonding.
• 5f electrons are more available for bonding.
• Both are equally available.
• Neither is available for bonding.

• Bulk metals are completely inert.
• Bulk metals are just as reactive.
• Bulk metals are still significantly reactive, but less so than finely divided.
• Finely divided metals are less reactive.