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Ch.2 - Atoms, Molecules & Ions

Chapter 2, Problem 46

How many elements are presently known? About how many occur naturally?

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Hello everyone today. We have the following problem, true or false. There are 118 currently known elements and about 90 of them occur naturally. This statement is going to be true. We do have 118 known elements, and indeed 90 of them naturally occur. And so ultimately this statement is going to be true Overall, I hope this helped, and until next time.
Related Practice
Textbook Question

Give molecular formulas corresponding to each of the following ball-and-stick molecular representations (red = O, gray = C, blue = N, ivory = H). In writing the formula, list the elements in alphabetical order. (a) Alanine (an amino acid)

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Textbook Question

Give molecular formulas corresponding to each of the following ball-and-stick molecular representations (red = O, gray = C, blue = N, ivory = H). In writing the formula, list the elements in alphabetical order. (b) Ethylene glycol (automobile antifreeze)

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Textbook Question

Give molecular formulas corresponding to each of the following ball-and-stick molecular representations (red = O, gray = C, blue = N, ivory = H). In writing the formula, list the elements in alphabetical order. (c) Acetic acid (vinegar)

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What are the molecular weights of the following pharmaceuticals? (a) C33H35FN2O5 (atorvastatin, lowers blood cholesterol)

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Textbook Question
Look at the alphabetical list of elements inside the front cover. What are the symbols for the following elements? (a) Gadolinium (used in color TV screens) (b) Germanium (used in semiconductors) (c) Technetium (used in biomedical imaging) (d) Arsenic (used in pesticides)
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Textbook Question
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