Question

question 15. select the correct nuclear notation for the isotope of sodium that has 11 protons and 12 neutrons.
$\frac{12}{11}na$
$\frac{23}{11}na$
$\frac{24}{12}na$
$\frac{24}{11}na$

Explanation:

Step 1: Recall nuclear notation rules

Nuclear notation has the form $_{Z}^{A}X$, where $Z$ is the atomic number (number of protons) and $A$ is the mass - number (sum of protons and neutrons).

Step 2: Determine the atomic number

The number of protons is 11, so the atomic number $Z = 11$.

Step 3: Calculate the mass - number

The number of neutrons is 12 and protons is 11. Mass - number $A=11 + 12=23$.

Step 4: Write the nuclear notation

For sodium (symbol $Na$), with $Z = 11$ and $A = 23$, the nuclear notation is $_{11}^{23}Na$.

Answer:

$_{11}^{23}Na$ (corresponding to the second option in the multiple - choice list)