Every element is represented by a nuclear symbol, which contains of three parts: (a) the atomic number, (b) the symbol and (c) the mass number of the specific isotope of the element. The symbol is represented as:
[tex]_{Z}^{A}X[/tex]
where, X is the chemical symbol of the element, A is mass number (sum of number of protons and neutrons in the nucleus), and Z is atomic number (number of protons in nucleus).
The atomic symbol of silicon is [tex]Si[/tex]
Atomic number of isotope of silicon, [tex]Z = 14[/tex]
Mass number of silicon, [tex]A = 29[/tex]
So, the nuclear symbol for the isotope of silicon is [tex]_{14}^{29}Si[/tex].
