I lost the periodic table my teacher gave me, and I need to find one online that shows charges at the top in columns, as well as charges for the elements with multiple charges online. Could you lead me to any good sources? Thanks

Go to the link below and scroll to a table of the most common ions and their charges:

http://en.wikipedia.org/wiki/Ion

Of course! There are several reliable sources online where you can find a periodic table that includes charges at the top of columns and multiple charges for elements. Here are a few options:

1. Royal Society of Chemistry (rsc.org): The RSC offers an interactive periodic table called "Visual Elements" that includes charges for elements with multiple oxidation states. You can access it at https://www.rsc.org/periodic-table/.

2. Periodic Table Live! (ptable.com): This website provides an interactive periodic table that includes charges at the top of columns as well as multiple charges for elements. You can visit the "Periodic Table Live!" section at https://ptable.com/.

3. WebElements (webelements.com): This website offers a comprehensive and customizable periodic table that includes charges at the top of columns and multiple charges for elements. You can find it at https://www.webelements.com/.

4. ChemSpider (chemspider.com): ChemSpider provides an interactive periodic table that includes charges for elements with multiple oxidation states. You can access it at https://www.chemspider.com/.

You can visit any of these websites to find a periodic table that suits your needs. Keep in mind that there are numerous other trustworthy sources available as well.