Paper 2 · Atomic structure, ions and covalent bonding
In Fig. 1, atom A forms a covalent compound with hydrogen, shown by a dot-and-cross diagram in which A shares one electron pair with each of four hydrogen atoms. What is the name of this compound?
Model answer
methane
Explanation: Atom A shares one electron pair with each of four hydrogen atoms, forming CH4, methane.
Derived from ZIMSEC Chemistry 5071/2 Paper 2 Theory, November 2013, Q1
