- can explain trends in reactivity as you go down a group in terms of the attraction between electrons in the outermost shell and nucleas, this electrostatic attraction depends on:
the distance between the outermost electrons and the nucleas
the number of occupied inner shells (energy levels) of electrons, which provide shielding effect
the size of the positive charge on the nucleas (called the nucleas charge)
- deciding how easy it is for atoms to lose or gain electrons from their outermost shell, these factors are taken into account. The increased nuclear charge, due to extra protons in the nucleas, going down a gorup is outweighed by the other 2 factors
-therefore electrons are easier for the larger atoms to lose going down a group, and harder for them to gain going down a group
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