Do atoms get bigger or smaller as you read from left to right

Which is true of transition metals when moving from left to right on the periodic table? the d sublevels are not filled across the period. the cation radii become larger across the period. atomic radii increase slightly and then start to decrease. atomic radii decrease slightly and then start to increase. o

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

1) this is the structure in the cell nucleus that houses a cell's genetic information