7.6% KCl I had the same problem on my semester exam for summer school
Answer:
The moon revolves around the Earth once every 29.5 days
Explanation:
So around 30 days.
This will be highly depended on the case,
for example, when hydrogen attached to electromotive atom, we call it hydrogen bonding.
if the electrons in two atoms make them temporary dipole, we called it london dispersion forces, etc
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