What element has a mass number of 55?

1 Answer
Nam D.
Mar 18, 2018

Manganese

Explanation:

On the periodic table, manganese is element number 24, and has an average atomic mass of 54.938 \ "amu", and we can round that off to 55 \ "amu".

![https://www.ptable.com/](useruploads.socratic.org)

So, I'd say that the element with a mass of 55 \ "amu" is manganese (Mn).

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