The element with the symbol "Be" is beryllium.
- The mass number of beryllium is typically 9 (since the most common isotope of beryllium is beryllium-9).
- The atomic number of beryllium is 4.
Therefore:
Blank 1: 9
Blank 2: 4
the element is BE
In the element above the mass number is and the atomic number is .
Blank 1:
Blank 2:
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