There are 5 people in a raffle drawing. Two raffle winners each win gift cards.
Each gift card is the same. How many ways are there to choose the winners?
Decide if the situation involves a permutation or combination, and then find
the number of ways to choose the winners.

idek

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.

the answer is d

step-by-step explanation: