Reactivity Trends in Group 7 | GCSE Chemistry
In Group 7, reactivity decreases down the group as it becomes harder to attract an electron.
Why does reactivity decrease as you go down Group 7?
What is Reactivity Trends in Group 7 | GCSE Chemistry?
"The trends in boiling point and reactivity for halogens, driven by increasing molecular size and decreasing attraction for electrons."
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?
Electron Attraction
Atomic radius increases down the group.
Outer shell is further from the nucleus.
Increased shielding makes it harder to pull in an incoming electron.
Less attraction means the halogen is less reactive.
Boiling Fact: Unlike Group 1, boiling points in Group 7 INCREASE as you go down because the molecules get larger.
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