In the periodic table, what is the last element in period 4 (the element at the far right of the fourth row)?

• A. Argon (Ar)
• B. Bromine (Br)
• C. Krypton (Kr)
• D. Calcium (Ca)

Answer: (C)

Verified step by step guidance

1. Understand that the periodic table is arranged in rows called periods, and each period ends with a noble gas element.
2. Identify that period 4 is the fourth row of the periodic table, starting with potassium (K) and ending with the noble gas in that row.
3. Recall that noble gases are located in Group 18, the far right column of the periodic table, and they mark the end of each period.
4. Look up or recall the noble gas in period 4, which is the element at the far right of the fourth row.
5. Confirm that the noble gas at the end of period 4 is Krypton (Kr), making it the last element in that period.