Potassium reacts more vigorously with water than sodium does.
Which statement explains this?
Potassium atoms have more electrons in their outer shell than sodium atoms.
The outer electron of potassium is nearer the nucleus, so it is lost more easily.
Potassium atoms gain an electron more easily than sodium atoms do.
The outer electron of potassium is further from the nucleus, so it is lost more easily.
64 exam-style questions on OCR GCSE Chemistry 2.2 Bonding, covering 2.2.1 Metals, non-metals and the Periodic Table, 2.2.2 Types of chemical bonding and dot and cross diagrams, 2.2.3 Limitations of bonding models, and 2.2.4 Reactivity, atomic number and the modern Periodic Table. Each one has a worked solution and a mark scheme showing where the marks go.