Which of the following transition metals belongs to Group 9 of the Modern Periodic Table?
Correct Answer: Cobalt
Subject: chemistry
- Cobalt
- Iron
- Chromium
- Titanium
Explanation: • <b>Key Fact</b>
Cobalt (Co, Z=27) belongs to Group 9, Period 4.
• <b>Supporting Detail</b>
Group 9 includes Cobalt (Co), Rhodium (Rh), Iridium (Ir), and Meitnerium (Mt).
• <b>Related Concept</b>
Titanium = Group 4, Chromium = Group 6, Iron = Group 8.
• <b>Why wrong options are wrong</b>
Iron, Chromium, and Titanium belong to Groups 8, 6, and 4 respectively.
• <b>Exam Trick</b>
Group 9 = Co, Rh, Ir, Mt.
• <b>Additional Info</b>
Cobalt-60 is a radioactive isotope used in radiotherapy.