2. Chemistry

Atoms - Smallest Unit of Matter

객관식
Which of the following is a trace element?
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객관식
If you were told that concentrations of trace elements above what is required by organisms generally have no effect on those organisms, what would you say?
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객관식
Which of the following is considered the smallest unit of matter?
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객관식
The number of protons in an uncharged atom __________.
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객관식
What are the four most abundant elements found in living systems?
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객관식
What is the smallest or basic unit of matter?
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객관식
There are __________ naturally occurring elements.
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객관식
A neutral atom of chlorine has an atomic number of 17. It has __________ electrons in its third shell.
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객관식
An element has eight protons, nine neutrons, and eight electrons. Its atomic number and atomic mass, respectively, are __________.
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객관식
The average oxygen atom has a mass number of 16 and an atomic number of 8. This means that the number of neutrons in this oxygen atom is:
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객관식
How many electrons would be present in the valence shell of a sulfur atom (atomic number 16, mass number 32)?
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객관식
A neon atom (Ne) is unreactive for which of the following reasons?

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객관식
What is generally true about essential elements and living organisms?
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객관식
Which of the following has negligible mass?
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객관식
An uncharged atom of nitrogen (atomic number = 7) has __________.
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