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There are only two chemical elements whose name begins with the letter Z. These elements are zinc and zirconium.
Element Z typically refers to the atomic number of an element. The atomic number (Z) represents the number of protons in the nucleus of an atom of that element. It determines the identity of the element because each element has a unique number of protons in its atoms. For example, hydrogen has an atomic number of 1 (Z=1), helium has an atomic number of 2 (Z=2), and so on, up to the heaviest naturally occurring elements.