Question

which element is in period 3, group 18? * 2 points
fluorine (f)
neon (ne)
chlorine (cl)
argon (ar)

Explanation:

• Locate Period 3 (the third row) and Group 18 (the last column) on the periodic table.
• Check each option:
• Fluorine (F) is in Period 2, Group 17.
• Neon (Ne) is in Period 2, Group 18.
• Chlorine (Cl) is in Period 3, Group 17.
• Argon (Ar) is in Period 3, Group 18.

Answer:

Argon (Ar)