Aufbau principle.
Answer:-
According to this principle“electrons are filled in various molecular orbitals in the increasing order of their energies”(,i.e molecular orbital with less energy is filled first.
angle of contact.
It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact The value of angle of contact depends upon (i) Nature of solid and liquid in contact (ii) Cleanliness of the surface in contact (iii) Medium above the free surface of liquid
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