Related Clues:

• Copper or chromium
• Gold or iron
• Titanium or tin
• Airport detector activator
• Water, perhaps, that's in a kettle
• Something found on a chemist's table
• Lithium or iridium
• Silver or platinum, e.g
• Any of the transition elements
• Einsteinium, for one
• Osmium or rhodium
• Genre featured on MTV's 'Headbangers Ball'
• Oxygen, e.g
• Iron, e.g
• Palladium, say, not empty after melee going out