d and f BLOCK ELEMENTS

What is the typical charge on an ion formed by a halogen (Group 17)?

• +1
• +7
• -1
• 0

What is the typical charge on an ion formed by an element in Group 2?

• +1
• +2
• +3
• 0

How many valence electrons does an element in Group 15 typically have?

• 3
• 5
• 7
• 8

Why do noble gases generally have positive electron gain enthalpies?

• They readily gain electrons.
• They have empty outer shells.
• They have stable, complete electron shells.
• They have low ionization enthalpies.

What is the significance of a large difference between the first and second ionization enthalpies of an element?

• It indicates the element is a noble gas.
• It often indicates the number of valence electrons.
• It indicates the element is highly reactive.
• It indicates the element has a full outer shell.