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ijm
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High schooler, class of 2022.
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Top Questions
7
votes
Why don't beryllium and magnesium dissolve in ammonia?
inorganic-chemistry
solubility
alkaline-earth-metals
asked Mar 14 at 14:50
chemistry.stackexchange.com
6
votes
Olympiad question: In the regular pentagon $ABCDE$, the perpendicular at $C$ to $CD$ meets $AB$ at $F$. Prove that $AE + AF = BE$.
geometry
contest-math
euclidean-geometry
plane-geometry
geometric-construction
asked Jun 16 '20 at 10:02
math.stackexchange.com
5
votes
How to solve this problem without using the binomial expansion?
combinatorics
permutations
asked Nov 18 '20 at 16:30
math.stackexchange.com
5
votes
Why is phenyl carbanion aromatic?
organic-chemistry
aromatic-compounds
asked Mar 20 at 14:43
chemistry.stackexchange.com
5
votes
Why does beryllium have an exceptionally high hydration energy?
inorganic-chemistry
solubility
coordination-compounds
ionic-compounds
asked Mar 23 at 4:45
chemistry.stackexchange.com
Top Answers
5
What is $x$, if $1! + 2! + 3! + \cdots + (x-1)! + x! = k^2$ and $k$ is an integer?
math.stackexchange.com
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