Catenation.
Answer:-
The self linking ability of an atom with other atoms of the same element is known as catenation.Carbon possesses maximum tendency for catenation in the periodic table.
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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