d and f BLOCK ELEMENTS

What is the atomic number of Lanthanum (La)?

• 56
• 57
• 58
• 59

How does the chemical behavior of later lanthanoids compare to other elements?

• More like Neon
• More like Fluorine
• More like Aluminium
• More like Sodium

How does the chemical reactivity of early lanthanoids compare to other elements?

• Similar to Helium
• Similar to Calcium
• Similar to Gold
• Similar to Fluorine

Why is the third ionization enthalpy of Lutetium (Lu) abnormally low?

• Low atomic number
• Large atomic radius
• Stability of the completely filled f level
• Low first ionization enthalpy

Why is the third ionization enthalpy of Gadolinium (Gd) abnormally low?

• High atomic mass
• Small ionic radius
• Stability of the half-filled f level
• High electron affinity