C. Lithium has 1 valence electron in its outer shell and so will react with a group 17 element in a 1:1 ratio.
The last number of group that an element belongs to on the periodic table tells the number of valence electrons that it will have.
- Lithium is in group 1 of the periodic table which means that it has only a single electron in its valence shell.
Group 17 elements have seven valence electrons and so need one more to achieve stability which is why they will react with Lithium (which has that one electron) in a 1:1 ratio.
Some of those elements include:
- Fluorine
- Chlorine
- Bromine
- Iodine
In conclusion therefore, Lithium has 1 valence electron and will react with group 17 elements in a 1:1 ratio.
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