What do you think causes the difference between the elements on the top of the periodic table, like carbon, with those on the bottom of the periodic table like tin or lead

Can someone me with 1 to 4 plz. fast

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

What are the major types of a chemical compound