The correct answer is: 2) "argon" ; or, " Ar " ;
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→ {which is the corresponding symbol for "argon" in the "Periodic Table of Elements"}.
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Explanation:
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Note that among the answer choices provided;
Answer choice: " 3) "hydrogen sulfide" {sic} is misspelled and is supposed to be: " 3) hydrogen sulfide " .
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Note that "argon" {" Ar " } is one single element. "Argon" is one of the 6 (six) "noble gases" , which are all "monatomic" as a gas; and are:
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1) helium (He), 2) neon (Ne), 3) argon (Ar), 4) krypton (Kr), 5) xenon, and: 6) radon (Rn) .
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Let us review the other answer choice provided to see if they are incorrect:
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Choice 1) "oxygen" ; is INCORRECT. "Oxygen" exists in gaseous form as either: " O₂ " —"oxygen gas"—which is "diatomic" [has 2 (two) atoms of oxygen per molecule—and as such, NOT "monatomic" ;
or: " O₃ " — "ozone gas" —which is "triatomic" [has 3 (three) atoms of oxygen per molecule—and as such, NOT "monatomic".
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Choice 3) "hydrogen sulfide" {Note the correct spelling: "sulfide"} — is INCORRECT. "Hydrogen sulfide" ; that is: " H₂ S " — is a gaseous compound that has 2 (two) atoms of hydrogen per molecule AND 1 (one) atom of sufur per molecule—with a total of 3 (three) atoms per molecule. Thus, "hydrogen sulfide" is "triatomic" —and as such, NOT "monatomic".
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Choice 4) "Ammonia" is INCORRECT. "Ammonia" ; that is: "NH ₃ " — exists as a gaseous compound that has 1 (one) atom of nitrogen per molecule AND 3 (three) atoms of hydrogen per molecule—with a total of 4 (four) atoms per molecule. Thus, "ammonia" is "polyatomic" —more specficially, "tetratomic"—and such, NOT "monoatomic".
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Shortcut tip: We can actually rule out Choices 3 and 4 really easily because they are "compounds" (consist of more than one element), which means, at the minimum, they would be "diatomic or having an even greater number of atoms"; and as such: NOT "monatomic" .
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Hope this answer—and explanation—are of help to you!
Best wishes!
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Answer:
I'm not really sure if you're interested in the electron dot diagram of the potassium and bromine atoms, or of potassium bromide,
KBr, so I'll show you both. You can use this example to find the electron dot diagram of hydrogen bromide, HBr.
Explanation:
They will repeal(that is the correct answer to the question)<
Answer:3
Explanation:
nitrogen is in the 5th column and needs 3 electrons to achieve the desired 8 electrons