Question

Fluorine, chlorine and Bromine are put in one group on the basis of their similar properties.

What are those similar properties?

Answer 1

In a particular group, electrons in the outermost orbit remain the same.

Fluorine, Chlorine and Bromine all have 7 electrons in their outermost orbit, showing similar properties. These properties are:

1. They form acidic oxides.
2. They form hydrides with hydrogen.
3. They form negative ions.
4. They dissolve quite effectively in CS₂, alcohol, and chloroform but only slightly in water.
5. They are coloured and non-metals.
6. Their B.P. and M.P. rise as they move down in the group.
7. Due to their high reactivity, they are usually found in a combined state.
8. They are good oxidising agents.