Please Help D: Which of the following elements has the smallest atomic radius?
A [Ar] 4s^2
B [Ar] 3d^10 4s^2
C [Ne] 3s^1
D [Ar] 4s^1

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

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?

How are the terms group and period used on the periodic table