The electronic configuration of an atom shows how its electrons are arranged in shells. Sodium has atomic number 11. Its electronic configuration is 2.8.1.
State the number of electrons in the outer shell of a sodium atom.
State the number of occupied shells in a sodium atom.
Magnesium has atomic number 12. Give the electronic configuration of magnesium.
Oxygen has atomic number 8. Give the electronic configuration of oxygen.
Sodium is in period 3. Explain how the electronic configuration of sodium shows this.
An element has the electronic configuration 2.8.7. Give the group number of this element.
50 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.