An element X X\,X has the ground-state electron configuration [Ar]3d104s24p3[Ar] 3d^{10} 4s^2 4p^3[Ar]3d104s24p3.
Using the periodic table, identify which of the following elements is in the same period as element XXX.
Phosphorus
Titanium
Sulfur
Tellurium
80 exam-style questions on Edexcel GCSE Chemistry 2.2 The periodic table, covering 2.2.1 Mendeleev's periodic table, 2.2.2 Periods, groups, metals and non-metals, and 2.2.3 Electronic configuration and position in the periodic table. Each one has a worked solution and a mark scheme showing where the marks go.