Referring to the reference periodic table, what do the elements fluorine, chlorine, and bromine have in
common?

All are located in the same period.
All have metallic properties.
All are halogens, so they are not very chemically active.
All have the same number of valence electrons.

they are located in the same period

Explanation:

they are in the same vertical row

D, All have the same number of valence electrons.

Explanation:

they are located in the same group so they should have the same number of valence electrons

c-reactive protein (crp) is an acute phase protein belonging to pentraxin family of proteins, whose levels increases 1000-fold or more in concentration in blood during the occurrence of an injury, inflammation or tissue death.

i think its white blood cells

i hope this