X is a shiny silver-coloured solid at room temperature and pressure.
X is a good conductor of heat and electricity when solid.
Which statement about X is correct?
1 )
X is an ionic compound or a metallic element.
2 )
X is a metallic element or a non-metallic element.
X is an alloy or a metallic element.
4 )
X is an alloy or a non-metallic element.
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