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

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Describing intermolecular forces use the drop down menus to match the type of intermolecular force to its name dipole dipole interactions dipole induced dipole interactions london dispersion forces hydrogen bond van der waals forces done

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it