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a vertical column of elements in the periodic table which have similar properties.
the transfer of energy through a material.
100 000 N per square metre. A pressure of 1 N Â· m2 is called one pascal (Pa).
an acid-base reaction in which there is a transfer of protons.
molecule where the ratio of atoms is 1 : 5, for example PCl5
mass per unit volume of a substance. The number of molecules in a particular area or a measure...