Why does the atomic radius decrease as you move along a period.
As you move along the period the proton number increases and the electrons are added to the same shell meaning no extra electron shielding occurs. Therefore the nuclear attraction to the outer most electron increases across the group and therefore the atomic radius decreases.
TM
Related Chemistry A Level answers
All answers ▸what is the shape and bond angle of NH3 and use VSEPR theory to explain the bond angle.
Why is the bond angle in an amide ion smaller than the bond angle in a molecule of ammonia?
By comparing the forces involved, explain why hydrogen iodide (HI) would have a higher boiling point than hydrogen bromide (HBr)?
The reversible reaction of sulfur dioxide and oxygen to form sulfur trioxide is shown below. 2SO2(g) + O2(g) 2SO3(g) An equilibrium mixture contains 2.4mol SO2, 1.2mol O2 and 0.4mol SO3. The total pressure is 250atm. What is the p(SO3)?