General Science
Atoms of an element differ from those of all other elements in

Atomic number and number of valence electrons.
Number of neutrons and number of valence electrons.
Atomic number and electronic configuration.
Number of neutrons and electronic configuration.

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General Science
Amalgams are

Highly coloured alloys
Alloys which contain mercury as one of the contents
Alloys which have great resistance to abrasion
Alloys which contain carbon

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