PPT Slide

• Information about the nuclear mass and charge can be  included with the atomic symbol (or element symbol).

• The atomic number (Z) is written as a left subscript and  the mass number (A) as a left superscript.

• The mass number is the sum of protons and neutrons.

carbon-12

oxygen-16

uranium-238

Number of neutrons = mass number - atomic number, or N = A - Z

Chlorine-35 atoms have A = 35, Z = 17, and N= 35 -17 = 18 n

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