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metallic sound; metallic clank
When he opened the door, a metallic sound echoed.
an alkali metal
Alkali metals are very reactive chemically.
a transition metal
Transition metals play an important role in chemical reactions.
state of emergency (governmental decree)
The government declared a state of emergency to prevent the spread of the new coronavirus.
metal detector
He used a metal detector to search for treasure on the beach.
an alkaline earth metal
Alkaline earth metals are located in Group 2 of the periodic table.
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