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Dotz
Keep in mind that atomic number is the number of protons in the atom of the element. Therefore, in the case where there are 78 protons, we can conclude that the atomic number of this element is ALSO 78. 

Let me know if you need anything else. 

                   - Dotz 
netnobdyfan18
It atomic number is 78, and the element is Platinum (Pt)
Its atomic mass is 195.078

hope this helps please mark brainliest

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