Answer:
refer to explanation in order V
Step-by-step explanation:
Atomic number: 54
Protons: 54
Electrons: 54
Neutrons: 77
Mass Number: 131.293 U
6 (1/2): At the upper left is the atomic number, or number of protons. In the middle is the letter symbol for the element (e.g., H). Below is the relative atomic mass, as calculated for the isotopes found naturally on Earth. At the very bottom is the name of the element (e.g., hydrogen).
6 (2/2): On the periodic table, the mass number is usually located below the element symbol.
I hope this helped!