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a state in which the outer energy level of an atom of any element is completely filled with electrons, similar to that of a noble gas.
molecule where the ratio of atoms is 1 : 3. So the bond angle is 1200, for example BF3
two or more different forms or structures of the same element.
a salt that can neutralise a base.
reactions in which oxidation and reduction take place (redox reaction).
a natural, hydrated ore of aluminium Al2O3âxH2O.