Hey there! Here is the answer:
B.) decrease; increase
Here's why:
As you move from left to right across a period on the periodic table the size of an atom will decrease. As you move from top to bottom down a group on the periodic table the size of an atom will increase.
I really hope this answer helps you out! :)
Moles of N2O5 = moles of NO2 * ( 2 moles of N2O5 / 4 moles of NO2
A persons weight changes as he travels from earth to space but his mass remains the same
