The diagram shows the structural formulas of three organic compounds, labelled X, Y, and Z.

Compound X is a hydrocarbon commonly used as a gaseous fuel.
Give the name of the other element besides carbon in compound X.
Practise Edexcel GCSE Chemistry Fuels with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.