9. Write the atomic notation for a sodium atom

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To write the atomic notation for a sodium atom, we need to identify the following:

1. **Atomic Number (Z)**: This is the number of protons in the nucleus of the atom. For sodium, the atomic number is 11.

2. **Mass Number (A)**: This is the total number of protons and neutrons in the nucleus. The most common isotope of sodium has 12 neutrons, so the mass number is $$11 + 12 = 23$$.

3. **Chemical Symbol**: The chemical symbol for sodium is $$ \text{Na} $$.

Putting this information together, the atomic notation for a sodium atom is written as:

$$
^{23}_{11}\text{Na}
$$

This notation indicates that sodium has a mass number of 23 and an atomic number of 11.
The atomic notation for a sodium atom is $$^{23}_{11}\text{Na}$$.

Write the atomic notation for a sodium atom

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