Alice takes 1/3 of the pennies from the jar. then brett takes 1/3 of the remaining pennies from the jar. finally, carla takes 1/3 of the remaining pennies from the jar, leaving 40 pennies in the jar. how many pennies were in the door at the start?

135 pennies

Step-by-step explanation:

 x= pennies in the door at the start

x-1/3x-1/3(x-1/3x)-1/3(x-1/3x-1/3(x-1/3x))=40

x = 135

Proof: 135-45-20 =40

135-45=90

90=30=60

60-20=40

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.