Ascientist wants to research the potential spread of germs by contact. she knows that the number of possible handshakes within a group of n people is given by the equation upper n equals one half left parenthesis n squared minus n right parenthesis . there are 105 people at a party. how many handshakes are possible?

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.