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Atomic shell
Hydrogen atom
radius of nth orbit
r
n
=
m
x
Å
nm
μm
mm
cm
dm
m
km
n mile
in
ft
yd
Planck's constant
h =
6.626E-34
J·s
electric constant
ε
0
=
8.854E-12
F/m
ordinal number of electron orbit (moving from nucleus)
n =
electron mass
m
e
=
9.109E-31
kg
elementary electric charge
e =
1.602E-19
C
1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"