Help please and thank you

18

Step-by-step explanation:

x = 37

Step-by-step explanation:

The angle with a measure of 74 degrees and the angle labeled "2x" are vertical angles

Vertical angles are congruent ( equal to each other )

Hence, 74 = 2x

             ^(note that we just created an equation that we can use to solve for x)

Now we solve for x

74 = 2x

step 1 divide each side by 2

74 / 2= 37

2x / 2 = x

we're left with x = 37

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.