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a bond formed when non-metal atoms share a pair of valence electrons to form a molecule.
100 000 N per square metre. A pressure of 1 N · m2 is called one pascal (Pa).
the electrons in a bond between two atoms will be displaced towards the more electronegative...
a reaction in which heat is absorbed from the surroundings and the temperature of the reaction...
coal that is heated in the absence of air to about 1 000 °C to remove volatile substances.