The Element X Has Three Naturally Occurring Isotopes

question 28

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)52.62
• B)56.14
• C)55.70
• D)55.40
• E)55.74

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Definitions:

Rapid Eye

Often associated with the rapid eye movement (REM) phase of sleep, characterized by quick movements of the eyes under closed eyelids, typically associated with vivid dreaming.

Dreams

A series of thoughts, images, and sensations occurring in a person's mind during sleep.

Postural Muscles

Muscles that are used to maintain body posture and balance, often working to hold the body stable in stationary positions and during movement.

EEG

Electroencephalography, a noninvasive method to record electrical activity of the brain via electrodes placed on the scalp, used in the diagnosis and monitoring of neurological disorders.