How to find the mass number of an element?

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have fill out chart of elements , ions. of spaces filled in, , blank. have filled in knew how do, there lot stuck on because didn't know mass number. ones, though, doesn't number of neutrons. example, here 1 row in chart:

element/ion= iron ion. atomic number=26. mass number = __blank__. #electrons= __blank__. #protons=26. #neutrons=__blank__. chemical symbol= fe2+.

gave me. , don't know how find neutrons without mass number , vice versa.

please tell me how find rather telling me google it. can't google during test , if tried i'd caught cause have really tiny class (15 kids) in chemistry class. , know it's not directly on pereodic table, , know it's not doubling atomic number either. told in class.

oh, , please put answers in simple terms? tried looking question earlier answers found complicated. help!!!

peace, love, & dinosaurs,

-miss flexible <3

i have fill out chart of elements , ions. of spaces filled in, , blank. have filled in knew how do, there lot stuck on because didn't know mass number. ones, though, doesn't number of neutrons. example,...


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