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OldSpice OldSpice
wrote...
Posts: 6432
9 years ago
Why were noble gases absent from Mendeleev’s original periodic table of 1871?
A) The noble gases are unstable.
B) The noble gases are radioactive.
C) The noble gases had not been discovered.
D) The noble gases occur only in compounds.
E) none of the above
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Answer accepted by topic starter
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
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