Specification Point 2.4C (Paper 2C Only):
Explain the trend in reactivity in Group 1 in terms of electronic configurations
Reactivity Trends & Electronic Configuration
Electronic configuration of the first three elements in group 1
Trend in Reactivity of Group 1:
- Reactivity of group 1 metals increases as you go down the group.
- Each outer shell contains only one electron, when group 1 metals react, they will lose one outer electron to get a full outer shell of electrons.
- As you go down group 1, the number of shells of electrons increases by 1 (period number increases down the periodic table).
- This means that the outer electron is further away from the nucleus so there are weaker electrostatic forces of attraction.
- This requires less energy to overcome the electrostatic forces of attraction between the negatively charged electron and the positively charged nucleus.
- This allows the electron to be lost easily, making it more reactive as you go down the group.
Aiming for a Level 9?
See if you’ve got what it takes. Test yourself with our topic questions.
Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.
More Edexcel IGCSE (9-1) Chemistry Revision Resources