Question

Which among the following is correctly represented?

• A. ${}_6^{12}\text{C}$
• B. ${}_{16}^8\text{O}$
• C. ${}_{23}^{11}\text{Na}$
• D. ${}_{10}^{19}\text{F}$

Answer 1

The correct option is A ${}_6^{12}\text{C}$

The symbolic representation of an element is as follows:
${}_{\text{Z}}^{\text{A}}\text{X}$, where A is mass number and Z is atomic number. The table given below shows the atomic numbers and mass numbers of elements:
$$\begin{array}{cccc}\text{Element}& \text{Atomic number}& \text{Mass number}& \text{Symbolic representation}\\ \text{Oxygen}& \text{8}& \text{16}& {}_8^{16}\text{O}\\ \text{Sodium}& \text{11}& \text{23}& {}_{11}^{23}\text{Na}\\ \text{Fluorine}& \text{9}& \text{19}& {}_9^{19}\text{F}\\ \text{Carbon}& \text{6}& \text{12}& {}_6^{12}\text{C}\end{array}$$Hence, only carbon atom is correctly represented.