Electron Arrangements in Monatomic Ions

Click Coached Problems for a self-study module on electron configurations of ions. 

As pointed out in Chapter 2, elements close to a noble gas in the periodic table form ions that have the same number of electrons as the noble-gas atom. This means that these ions have noble-gas electron configurations. Thus the three elements preceding neon (N, O, and F) and the three elements following neon (Na, Mg, and Al) all form ions with the neon configuration, is22s22p6. The three nonmetal atoms achieve this structure by gaining electrons to form anions  

The three metal atoms acquire the neon structure by losing electrons to form cations  

The species N3, O2-, F, Ne, Na+, Mg2+, and Al3+ are said to be isoelectronic that is, they have the same electron configuration. 

Cations, anions, and atoms with ground state noble-gas electron cnnfigurations. Atoms and ions shown in the same color are isoelectronic tint. is. they have the same electron configiratiorts. 

The three metal atoms acquire the neon structure by losing electrons to form cations iiNa (ls 2s 2p 3s )----------------------------- uNa+ (ls 2s 2p ) + 

Transition metai ions. Transition metal ions impart color to many of their compounds and solutions. 

The s electrons are first in with the atoms and first out with the cations. 

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With this background, we show how electron arrangements in multielectron atoms and the monatomic ions derived from them can be described in terms of—... 

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