Question

different elements are most likely to react in similar ways when they... a. are members of the same period b. are member of the same group/family c. have nearly the same atomic mass d. have the same number of neutrons

Explanation:

Elements in the same group/family have similar chemical properties because they have the same number of valence electrons. Valence electrons are responsible for an element's chemical reactivity.

• Option a: Elements in the same period have different valence electron configurations, so their chemical reactivities are not similar.
• Option c: Atomic mass does not determine chemical reactivity.
• Option d: The number of neutrons does not affect chemical reactivity.

Answer:

B. Are member of the same group/family