What trend in atomic radius do you see as you go across a periodic on the periodic table

Find the mass in grams of 1.37x1020 particles of h3po4

When a nucleus absorbs a neutron and then breaks apart, there are many products of the reaction. what is not a product of a nuclear fission reaction

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.