[Chemistry Tips] A vs Z

Hi student,

Today's tip is about the difference between Atomic Number (Z) and Atomic Mass Number (A).

In the periodic table, a symbol is used to designate an element, and each atom is characterized by a value of A and Z. The atomic number (Z) is at the lower left of the symbol, and atomic mass number (A) is at the upper left.

Atomic Number (Z): Its value is equal to the number of protons in the nucleus.

Atomic Mass Number (A): Its value is equal to the number of protons plus the number of neutrons in the nucleus.

Chemically, an atom is made of three species: Neutrons, Protons, and Electrons. The nucleus of the atom contains the protons and neutrons. However, for the most part chemists focus their attention on the electrons, which govern the chemical properties and reactivity of any molecule.

Until next time, student, keep it up!

Committed to Your Success
Wayne Huang, PhD
"The Rapid Learning Coach"
ChemTips@RapidLearningCenter.com

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