How many valence electrons does #"Na"# have?

1 Answer
Stefan V.
Aug 4, 2016

Sodium has #1# valence electron.

Explanation:

Your tool of choice here will be the Periodic Table of Elements.

Grab one and look for sodium, #"Na"#. You'll find it located in period #3#, group #1#.

http://igoscience.com/periodic-table-focus-on-sodium-na/

The thing to remember about main-group elements, which are those elements located in groups #1#, #2#, and #13# through #18#, is that their group number tells you the number of valence electrons.

In your case, sodium is located in group #1#, which means that it has #1# valence electron. This valence electron is located in sodium's third energy shell.

http://slideplayer.com/slide/8713253/

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