Question

1. which of the following statements correctly describes the properties of elements based on their group in the periodic table?

• alkali metals in group 1 have one valence electron and are very reactive
• alkaline earth metals in group 17 have seven valence electrons and are highly reactive.
• halogens in group 2 have two valence electrons and are very reactive.
• noble gases in group 16 have six valence electrons and are highly reactive.

Explanation:

• Analyze each option:
• Option 1: Alkali metals are in Group 1, have 1 valence electron, and are very reactive (matches periodic table properties).
• Option 2: Alkaline earth metals are in Group 2, not 17. Group 17 has halogens with 7 valence electrons. So this is wrong.
• Option 3: Halogens are in Group 17, not Group 2. Group 2 has alkaline earth metals with 2 valence electrons. So this is wrong.
• Option 4: Noble gases are in Group 18, have 8 valence electrons (except He with 2), and are inert (not reactive). So this is wrong.

Answer:

A. Alkali metals in Group 1 have one valence electron and are very reactive