A navy boat goes 50 miles downstream in 2 1/2 hours. Going upstream it traveled the same distance in 4 hours. What is the rate of the boat in still water, and what is the rate of the current?

d

step-by-step explanation:

2nd one in the first row is correct

deez nu tz

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.