Which characteristic of an element determines its placement in the periodic table? O A. number of protons O B. size O C. mass O D. number of neutrons​

it gonna be A. Number of protons  

Explanation

Elements are placed in order on the periodic table based on their atomic number, how many protons they have.

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.