Chemistry – The Periodic Table - Group VII properties | e-Consult
The Periodic Table - Group VII properties (1 questions)
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Moving from chlorine to fluorine (left to right across a period, not down the group) shows the following trends:
- Density increases: Density increases because the atomic mass increases. Fluorine has the highest atomic mass of the three.
- Reactivity increases: Reactivity increases because the effective nuclear charge increases. This stronger attraction pulls the valence electrons closer to the nucleus, making the atom more likely to accept electrons and form ions.
- Electronegativity increases: Electronegativity increases because the effective nuclear charge increases. This stronger attraction to electrons results in a greater tendency to attract electrons in a chemical bond.
These trends are directly related to the electronic structure of the halogens and the principles of effective nuclear charge.