Physics
Isotopes of an element contain

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

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Physics
Solids have definite shapes.This is because

The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are large
The forces of adhesion are less

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