Which of the following isotopes is not commonly used for dating objects? a. carbon-14 b. phosphorus-32 c. potassium-40 d. rubidium-87

The correct answer is phosphorus-32-32.

Explanation:

Phosphorus-32 is an isotope of phosphorus found in many organic molecules. They are used to detect metabolic pathways of involving bio-molecules. Also used to detect malignant tumors in the body of the living being.

Where as:

Carbon-14 is used for carbon-14 dating also known as radiocarbon dating. this is used to determine age of  old objects.

Potassium-40 id used to determination of age of rocks and minerals. Specially used in potassium argon dating.

Rubidium-87 is an isotope of rubidium element used to  determine age of rocks.

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.