Reactivity Trends in Group 1 | GCSE Chemistry
Reactivity increases down Group 1 because the outer electron is further from the nucleus.
Why does reactivity increase as you go down Group 1?
What is Reactivity Trends in Group 1 | GCSE Chemistry?
"The trend in reactivity for alkali metals, driven by the increasing distance of the outer electron from the nucleus."
Mendeleev left gaps in his periodic table. Why?
Why did Mendeleev's periodic table become widely accepted?
Which halogen is a red-brown liquid at room temperature?
How many electrons do Group 1 metals have in their outer shell?
Electron Shielding
Atomic radius increases down the group.
Outer electron is further from the positive nucleus.
More shielding from inner electron shells.
Attraction between nucleus and outer electron is weaker, so it is lost more easily.
Key Term: Always mention "atomic radius" and "shielding" when explaining trends.
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