If We Know That Teenagers Are Smoking Less Often Now

question 7

Multiple Choice

If we know that teenagers are smoking less often now than teenagers were in 1980, which piece of descriptive epidemiology do we have?

• A) Person
• B) Place
• C) Time
• D) Cause

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Definitions:

Octet

A rule in chemistry stating that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas.

Methyl Chloride

A chemical compound with the formula CH3Cl, known for its use in industrial processes as a solvent and in organic synthesis.

Lewis Structure

A representation of molecules showing how the valence electrons are arranged among the atoms in the molecule, including any lone pairs of electrons.