Most of the elements of Groups III to VII form hydrides which are
essentially covalent. Some examples are Group IV, methane CH4;
Group V, phosphine PH3; Group VI, hydrogen sulphide H2S;
Group VII, hydrogen chloride, HC1. There are several points to
notice about these covalent hydrides. First, they are nearly all
volatile liquids or gases; but the simple hydrides NH3, H2O and HF,
formed from the head elements of Groups V-VI1, show hydrogen
bonding characteristics which make them less volatile than we
should expect from the small size of their molecules (p. 52).
Most of the elements of Groups III to VII form hydrides which areessentially covalent. Some examples are Group IV, methane CH4;Group V, phosphine PH3; Group VI, hydrogen sulphide H2S;Group VII, hydrogen chloride, HC1. There are several points tonotice about these covalent hydrides. First, they are nearly allvolatile liquids or gases; but the simple hydrides NH3, H2O and HF,formed from the head elements of Groups V-VI1, show hydrogenbonding characteristics which make them less volatile than weshould expect from the small size of their molecules (p. 52).
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