Ayouth club has 60 members
40 of the members are boys
20 of the members are girls
a mean amount of videos watched last week by all members was 2.8
mean number of videos watched by the boys was 3.3
calculate the mean number of videos watched last week by the 20 girls.
show working out

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.

answer: you need to organize this better it does not make sense.

step-by-step explanation: ?