Questions tagged [periodic-table]

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3 votes
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Are there substances that were initially thought to be elements but are actually compounds?

I am wondering what are good examples of substances that were initially thought to be elements but then were found out to be compounds. How exactly were these substances found to be compounds?
Maximal Ideal's user avatar
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1 answer
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Naturally occurring elements in other planets and their natural satellites other than earth [closed]

Naturally occurring elements Is it possible to find natural elements in other planets and their natural satellites other than planet earth?
Prashant Akerkar's user avatar
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1 answer
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Why isn't the symbol for Beryllium 'B' rather than 'Be'?

What I have understood is, generally the symbol of an element is kept as the first letter of the element's name itself (H, N, O...) unless there's already a symbol with that letter, in that case, we ...
Rohit Joshi's user avatar
2 votes
1 answer
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Element classification by Döbereiner and Newland (law of octaves)

I have been recently studying periodic classification. I am having some confusion regarding old periodic classification. Newland's law of octaves In that you can see, in the 4th horizontal line, ...
Suresh Chandra Pal's user avatar