In which orbital does an electron in a lead atom experience the greatest effective nuclear charge?

The 1st subshell have no inner electrons to provide shielding is Electrons, and thus feel the full nuclear charges, the greatest effective nuclear charge in a many-electron atom is an electron in a 3s subshell experience. Then the value of n is greater than or equal to 3, electrons can reside in d orbitals.

the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.

question

which are human systems?

the amazon rain forest

the appalachian trail

the george washington bridge

the himalayas

the hoover dam

the north american free trade agreement