Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.
The densities of the liquid in the two vessels are equal.
Both its limbs are of unequal length.

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Physics
Isotopes of an element contain

the same number of protons but different number of neutrons
the same number of neutrons but different number of protons
equal number of protons and electrons
equal number of nucleons

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