Question

the sodium isotope with 12 neutrons
express your answer as an isotope.
a chemical reaction does not occur for this question.
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part d
the aluminum isotope with 14 neutrons
express your answer as an isotope.
a chemical reaction does not occur for this question.

Explanation:

Step1: Find sodium's atomic number

Sodium (Na) has an atomic number $Z=11$.

Step2: Calculate sodium's mass number

Mass number $A = Z + \text{neutrons} = 11 + 12 = 23$.

Step3: Write sodium isotope notation

Isotope format: $^{A}_{Z}\text{Symbol}$, so $^{23}_{11}\text{Na}$.

Step4: Find aluminum's atomic number

Aluminum (Al) has an atomic number $Z=13$.

Step5: Calculate aluminum's mass number

Mass number $A = Z + \text{neutrons} = 13 + 14 = 27$.

Step6: Write aluminum isotope notation

Isotope format: $^{A}_{Z}\text{Symbol}$, so $^{27}_{13}\text{Al}$.

Answer:

1. $^{23}_{11}\text{Na}$
2. $^{27}_{13}\text{Al}$