The Element X Has Three Naturally Occurring Isotopes

question 57

Multiple Choice

The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu.

• A)159.4
• B)162.0
• C)163.1
• D)161.5
• E)163.0

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Definitions:

Encoded

The process by which information is transformed into a format that can be stored and used in memory.

Explicit Memory

Memory of facts and experiences that one can consciously know and “declare.” (Also called declarative memory.)

Iconic Memory

A type of visual sensory memory that holds a brief photographic image of a scene that has just been observed, for a very short period.

Sensory

Related to or involving the organs or processes responsible for receiving and interpreting stimuli from the outside world.