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.
Which quantity characterizes a chemical element’s nucleus?
Its atomic number, .
What is a period in the periodic table?
A row.
What changes when the periodic table moves from one period to the next?
A new electron shell begins filling.
How do elements in the same periodic-table column compare in valence electrons and ion type?
They have the same number of valence electrons and form the same type of ion.
Answer 9 questions on Cortège électronique et tableau périodique.
1. Which description identifies an atom’s outermost electron shell?
2. What distinguishes valence electrons from core electrons in an atom?
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