4. Mercury (11) oxide decomposes into mercury and oxygen gas according to the following UNBALANCED equation.
Hgo
_Hg + O2
b) how many moles of mercury are produced if 24.5 moles of mercury (ll) oxide decompose?

you need to give more information

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.