That permits you to compare the size of the elements in a group:Fluorine and chlorine are in the same group (17), with chlorine directly below fluorine, so the atomic radius of chlorine is larger than the atomic radius of fluorine.Sulfur and oxygen are in the same group (16), with sulfur directlly below oxygen, so sulfur the atomic radius of sulfur is larger than the atocmi radius of oxygen. Atomic radius increases from top to bottom within a group due to electron shielding. (ii) Explain why the first ionisation energy of sulphur is lower than would be predicted from. With that:Oxygen and fluorine are in the period 3, being oxygen to the left of fluorine, so oxygen is larger than fluorine.Sulfur and chlorine are in the period 4, being sulfur to the left of chlorine, so sulfur is larger than chlorine. (b) An atom of element Z has two more protons and two more. Hence, you can compare the elements that belong to a same period and predict that the atom with lower atomic number (number of protons) will haver larger atomic radius. Are ions of alkali metals larger or smaller than ions of alkaline earth metals from. Strontium has a greater atomic radius than that of beryllium. Which element in the second period has the greatest atomic radius. Cadmium has larger atomic radius than sulfur.ĭown a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period: when a proton is added the pull of the electrons towards the nucleus is larger, so the size of the atom decreases. This problem has been solved Sulfur has a smaller atomic radius than that of silicon.
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