An Element Has Two Naturally Occurring Isotopes

question 7

Multiple Choice

An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass of 184.953 amu. The other has an abundance of 62.6% and a mass of 186.956 amu. What is the atomic weight of the element?

• A)185.702 amu
• B)185.954 amu
• C)186.207 amu
• D)186.956 amu
• E)190.234 amu

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Definitions:

Carbon

A chemical element with symbol C and atomic number 6, which is the basis of all known life on Earth and a component of many chemical compounds.

Oxygen

A chemical element (O) with atomic number 8, essential for respiration in most living organisms and a key component of water and most organic compounds.

CCC Bond Angle

Refers to the angle between the carbon atoms within a molecule, particularly relevant in organic compounds.

Hybrid Atomic Orbitals

Orbitals that form from the combination of standard atomic orbitals, explaining the shape and bonding in molecules.