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

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