A molecule shouldn't have valence electrons left.
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There are 18 valence electrons in one molecule of S2Cl2. Each sulfur atom contributes 6 valence electrons, and each chlorine atom contributes 7 valence electrons.
A molecule of crotononitrile (C4H5N) has 9 valence electrons. This is calculated by adding the valence electrons of each element: carbon (4), hydrogen (5), and nitrogen (1).
To find the number of valence electrons in a molecule, you can look at the group number of each element in the molecule on the periodic table. The group number is usually the same as the number of valence electrons for that element. Add up the valence electrons from each atom in the molecule to get the total number of valence electrons for the molecule.
The NCl3 molecule, like most other stable molecules, exist because they share electrons in such a way as to close out the valence shell. Therefore, although one usually doesn't say so in regards to molecules, NCl3 has 8 valence electrons.
Zinc has 2 valence electrons.
Aluminum has 3 valence electrons.