Conceptual Physics

(Sean Pound) #1

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 =


Copyright 2007 Kinetic Books Co. Chapter 38^701

Free download pdf