Oxygen Has an Atomic Number of 8 and an Atomic

question 156

Multiple Choice

Oxygen has an atomic number of 8 and an atomic mass of 16. How many valence electrons does it have?

• A) 2
• B) 4
• C) 6
• D) 8
• E) 16

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Definitions:

Time

A continuous sequence of events, perceived by its passage and measurable in hours, minutes, and seconds.

Experimental Manipulation

The process of intentionally changing a variable in an experiment to study its effects on other variables.

Interrupted Time Series Design

A design in which the effectiveness of a treatment is determined by examining a series of measurements made over an extended time period both before and after the treatment is introduced. The treatment is not introduced at a random point in time.

Control Series

A control series is a sequence of observations or measurements used in experiments or statistical analysis as a standard of comparison to detect changes or effects.