Copper has two naturally occurring isotopes, including 65Cu. Look at the periodic table and tell whether the second isotope is 63Cu or 66Cu.

Verified step by step guidance

Step 1: Understand that the atomic mass of an element on the periodic table is a weighted average of the masses of its naturally occurring isotopes.

Step 2: Locate copper (Cu) on the periodic table and note its atomic mass, which is approximately 63.55 amu.

Step 3: Recognize that copper has two naturally occurring isotopes: 65Cu and another isotope that we need to identify.

Step 4: Consider the possible isotopes: 63Cu and 66Cu. The atomic mass of copper (63.55 amu) is closer to 63 than to 66.

Step 5: Conclude that the second isotope is likely 63Cu, as the average atomic mass (63.55 amu) is closer to 63 than to 66, indicating a higher abundance of 63Cu compared to 65Cu.

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