What are the vertical columns of the periodic table called?

A) families
B) periods
C) either a or b
D) neither a nor b


A

Environmental & Atmospheric Sciences

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A common inactive ingredient in products such as sunscreen lotions and shampoo is triethyl amine, also known as TEA. Which of the following is the chemical structure for this compound?

A. a B. b C. c D. d

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Looking at the map (11.5), the three major U.S. cities with the highest risk of tornados are ________

Fill in the blank(s) with correct word

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The ammonoids are excellent guide fossils because of distinctive physical features, a short life span, and a wide

geographic distribution. a. True b. False

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The leading theory for the mass extinction 65 million years ago is a huge meteorite hitting the earth in the area of the Yucatan Peninsula, Mexico.

a. true b. false

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