Question

question 4 of 10
based on the number of valence electrons indicated by its location in the periodic table, which elements behavior would you predict to be closest to that of potassium (k)?
a. krypton (kr)
b. chromium (cr)
c. francium (fr)
d. strontium (sr)

Explanation:

• Elements in the same group (column) of the periodic table have similar chemical properties because they have the same number of valence electrons.
• Potassium (K) is in Group 1 (alkali metals).
• Krypton (Kr) is in Group 18 (noble gases) with 8 valence electrons (except helium which has 2).
• Chromium (Cr) is a transition metal in Group 6.
• Francium (Fr) is in Group 1 (alkali metals) like potassium, so it has 1 valence electron.
• Strontium (Sr) is in Group 2 (alkaline earth metals) with 2 valence electrons.

Answer:

C. Francium (Fr)