Atomic mass unit
u = 1.66054 × 10í^27 kg
u = atomic mass unit (amu)
Mass number
A = Z + N
A = mass number
Z = atomic number
N = neutron number
38.4 - Interactive checkpoint: using Z, N and A
A neutral atom of sodium-23 has 11
protons and a mass number of 23.
How many electrons does it have?
How many neutrons does it have?
Answer:
Number of electrons =
Number of neutrons =