Les électrons de valence sont dans la couche externe ; les électrons de cœur sont dans les couches internes.
★ Must-know
Les électrons sont répartis dans des couches électroniques, qui peuvent elles-mêmes être divisées en sous-couches.
Une couche de nombre quantique principal n peut contenir au maximum électrons.
Une sous-couche s peut contenir au maximum 2 électrons, tandis qu’une sous-couche p peut en contenir jusqu’à 6.
Further detail
1. Which description identifies an atom’s outermost electron shell?
2. What distinguishes valence electrons from core electrons in an atom?
3. What is the maximum number of electrons in a shell with principal quantum number ?
What is the outermost electron shell?
The last electron shell containing at least one electron.
Which electrons can participate in forming chemical bonds?
Valence electrons.
How are electrons organized within atoms?
They occupy electron shells, which can be divided into subshells.
What quantum number characterizes an electron shell?
A strictly positive integer .
What does an atom’s electronic configuration describe?
The distribution of its electrons among its subshells.
In what order do subshells fill up to 18 electrons?
1s, 2s, 2p, 3s, then 3p.
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