Mr and mrs smith each have a car. mr smiths car has needed 6 tyres and 2 batteries since new. mrs smiths car has needed 9 tyres and 1 battery. a. how many tyres and batteries have the smiths needed together? b. use t to stand for a tyre and b to stand for a battery. write down an expression and then simplify it, to show how to get your answer in part a.

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.