Question

1. using the average atomic mass found on the periodic table, determine the most abundant isotope between the pairs given. type using the format used: element - mass aluminum - 26 or aluminum - 27 sodium - 22 or sodium - 23 krypton - 83 or krypton - 84

Explanation:

Step1: Recall average atomic mass concept

The average atomic mass on the periodic - table is closest to the mass of the most abundant isotope.

Step2: Analyze Krypton isotopes

The average atomic mass of Krypton is approximately 83.80. Krypton - 83 is closer to this value compared to Krypton - 84. So the most abundant isotope is Krypton - 83.

Step3: Analyze Sodium isotopes

The average atomic mass of Sodium is approximately 22.99. Sodium - 23 is closer to this value compared to Sodium - 22. So the most abundant isotope is Sodium - 23.

Step4: Analyze Aluminum isotopes

The average atomic mass of Aluminum is approximately 26.98. Aluminum - 27 is closer to this value compared to Aluminum - 26. So the most abundant isotope is Aluminum - 27.

Answer:

Krypton - 83
Sodium - 23
Aluminum - 27