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the substance that liberates electrons (undergoes oxidation) and causes the other substance to be reduced.
a group of elements that are non-reactive, monatomic gases (Group 0, 8 or 18).
this consists of three separate layers of the Earth â the crust, the mantle and the core.
100 000 N per square metre. A pressure of 1 N · m2 is called one pascal (Pa).