Asap will mark brainliest an atom of element a has 78 protons. what would the element's atomic number be?

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 

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

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Burning Paper

Explanation:

Burning Paper is an example of a chemical change because;

-  A new substance called  ''Ash'' is formed.

- It is an irreversible reaction.