Which particular element is required for blood clothing?

VITAMINE K

Thromboplastin + Prothrombin + calcium-->Thrombin

Thrombin + Fibrinogen-->Fibrin

chlorofil, carotine,platlet, and vitamin k...

Blood Clotting I believe you mean "K" factor is a very important compound in this VERY complex process.

http://en.wikipedia.org/wiki/Blood_clotting

fibrinogen is one of the element which causes blood clotting. but there are still 18 more constituents which are required for blood clotting. absence of any of these elements...... may cause trouble............

if u want to know more about those elements use any haematology book to get the information.

there are several factors... but if you mean a specific chemical element.... Calcium plays a critical role.