ah-haa!
that was it, that was what was causing all my problems. i thought that because it said they were 5.0x10^-10m apart i thought that was the diameter, and that i wanted the square of the radius... i just calculated it all again and i get it now... its carbon...
thanks muchly
big hugs...
full equation
okay, so using Fe = -Ke Q1 Q2 / r^2
Fe = 5.5x10^-9 N
-Ke = -9.0x10^9 Nm^2C^-2
Q1 = 1.6x10^-19C
r^2 = 6.25x10^-20m^2
Q2 = 5.5x10^-9 x 6.25x10^-20 / -9.0x10^9 x 1.6x10^-19
Q2 = -2.39x10^-19C
but the main part of the problem is the part where i have to use the 2...
[SOLVED] using electric force to calculate number of protons
Homework Statement
a hydrogen nucleus and a nucleus of an unknown atom are stationary, 5.0x10^-10m apart, the electric charge on the hydrogen nucleus is 1.6x10^-19C.
express the charge you have calculated for the unknown nucleus...