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OldSpice OldSpice
wrote...
Posts: 6432
9 years ago
Why was argon absent from Mendeleev’s original periodic table of 1871?
A) Argon is unstable.
B) Argon is radioactive.
C) Argon had not been discovered.
D) Argon occurs only in compounds.
E) none of the above
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ElectricElectric
wrote...
Top Poster
Posts: 6431
9 years ago
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.silent.boss

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OldSpice Author
wrote...
9 years ago
Perfect!

..Thank you so much for your support
wrote...
9 years ago
My pleasure
.silent.boss
wrote...
3 years ago
Thank you
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