Arrange the atoms:

Question

Arrange the atoms: Ca, Br, Ge, Rb, in order of increasing atomic radius. Only type in the chemical symbols in the blanks. 

Answer 1

smallest atomic radius -> largest atomic radius

Br, Ge, Ca, Rb

reasoning:

as you go from left to right on the periodic table the atomic radius decreases

going from top to bottom the atomic radius increases

Bromine is the furthest left and its above Rubidium so it has the smallest atomic radius

Germanium and Calcium are on the same row or period as bromine but germanium is further to the right than calcium but not as far as germanium so it has the second smallest atomic radius

Calcium is on the same row as Ge and Br but its in group 2 so its radius is larger than Br and Ge

the largest is rubidium as its the furthest period down the table relative to the other elements mentioned therefore it has the largest atomic radius