Which of the following are necessary when proving that the opposite sides of a parallelogram are congruent? Check all that apply. A. Opposite sides are parallel.

B. Corresponding parts of congruent triangles are congruent.

C. Corresponding parts of similar triangles are similar.

D. Opposite sides are perpendicular.

Opposite sides are parallel

Corresponding parts of congruent triangles are congruent

Step-by-step explanation:

d

step-by-step explanation:

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.