Question

Atomic number of silicon is 14. If there are three isotopes of silicon having 14, 15 and 16 neutrons in their nuclei, what would be the symbol of the isotope?

Answer 1

Answer:

29. 30

Si. Si. are the 2 isotopes

14. 14

Answer 2

Isotopes are same element with different mass number. In isotopes, the atomic number remains the same.

Atomic number = Number of Protons (from question, wkt it is 14)

Mass number = Number of Protons + Number of Neutrons

Thus, in isotopes, the number of neutrons varies. Symbol of a isotopes comprises of element symbol, atomic number, and mass number. The mass number is denoted in the upper left of the symbol. The atomic number is denoted in the lower left of the symbol.

The symbol of silicon with 14 neutrons is:  $\bold{_{14}^{28}\textrm{S}}$

The symbol of silicon with 15 neutrons is: $\bold{_{14}^{29}\textrm{S}}$

The symbol of silicon with 16 neutrons is: $\bold{_{14}^{30}\textrm{S}}$