Multiple Choice
What are the four most abundant elements found in living systems?
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A neutral atom of chlorine has an atomic number of 17. It has __________ electrons in its third shell.
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:
How many electrons would be present in the valence shell of a sulfur atom (atomic number 16, mass number 32)?
A neon atom (Ne) is unreactive for which of the following reasons?
How many electrons does an Oxygen atom need to fulfill the octet rule by filling its valence shell?
Which of the following is true about electron energy shells?