Problem: This question has multiple parts. Work all the parts to get the most points.Strontium has four isotopes. Strontium-84 has a very low natural abundance but  86Sr, 88Sr, and 88Sr are all reasonably abundant. Knowing the atomic weight of strontium is 87.62, which of the more abundant isotopes predominates? Chlorine has two isotopes. Both 35Cl and 37Cl are reasonably abundant. Knowing the atomic weight of chlorine is 35.45, which of the isotopes predominates? Boron has two isotopes. Both 10B and 11B are reasonably abundant. Knowing the atomic weight of boron is 10.81, which of the isotopes predommates? 

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This question has multiple parts. Work all the parts to get the most points.

Strontium has four isotopes. Strontium-84 has a very low natural abundance but  86Sr, 88Sr, and 88Sr are all reasonably abundant. Knowing the atomic weight of strontium is 87.62, which of the more abundant isotopes predominates? 

Chlorine has two isotopes. Both 35Cl and 37Cl are reasonably abundant. Knowing the atomic weight of chlorine is 35.45, which of the isotopes predominates? 

Boron has two isotopes. Both 10B and 11B are reasonably abundant. Knowing the atomic weight of boron is 10.81, which of the isotopes predommates?