The outermost electron of boron experiences a lower effective nuclear charge than carbon. why?

As you watch a surfer ride a wave towards the shoreline, what is the shoreline? a) displacement reference b) reference point c) coordinate plane d) cartesian boundary

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?