11.
The symbol of sodium is Na and its atomic number is 11.
The chemical symbol for the element of Sodium is Na and its atomic number is 11.
Sodium symbol: Na Atomic number: 11
The atomic number of F is 9, Na is 11, so F (9) + Na (11) = 20. The element with an atomic number of 20 is calcium (Ca).
The element with the lowest atomic number in period 3 is sodium (Na) with an atomic number of 11.
Sodium (Na) is atomic number 11.
The symbol of sodium is Na and its atomic number is 11.
Calcium=Ca=Atomic number 20 9+11=20
The atomic number of F (fluorine) is 9 and the atomic number of Na (sodium) is 11. Adding them together gives 20, which is the atomic number of calcium (Ca).
At No(F) + At No(Na) = 20.At No of Calcium = 20.
Sodium, symbol is Na
Sodium = NaAtomic number = 11