A student makes three statements about Mendeleev's periodic table.
Statement 1: Mendeleev ordered the elements mainly by increasing relative atomic mass
Statement 2: Mendeleev put elements in the same group if their atoms had the same number of outer-shell electrons
Statement 3: Mendeleev predicted the properties of undiscovered elements from the properties of neighbouring elements in his table
Which statements are correct?
1 only
1 and 2 only
1 and 3 only
2 and 3 only
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.