~Help me with this please it’s a math test answer correctly and I will mark as BRANLIEST and I will give you 55 points!!

the weight of 1 textbook is 2 pounds

the weight of 1 game is about 0.5 pounds

Step-by-step explanation:

1/2 of 2 = 0.5 pounds

0.5 times 8 (games) = 4

22 - 4 = 18

18 divided by 9 (textbooks) = 2 pounds

20%

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.