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Brass die, along with zinc and copper samples. Brass is an alloy of copper and zinc; the proportions of zinc […]

Copper is a chemical element with the symbol Cu (from Latin: cuprum) and atomic number 29. It is a ductile

Neutron The quark structure of the neutron. (The color assignment of individual quarks is not important, only that all three

  ElectronExperiments with a Crookes tube first demonstrated the particle nature of electrons. In this illustration, the profile of the

Proton The quark structure of the proton. (The color assignment of individual quarks is not important, only that all three

  A figurative depiction of the helium-4 atom. In the nucleus, the two protons are shown in red and neutrons

Poor metals (or Other Metals) The trivial name poor metals is sometimes applied to the metallic elements in the p-block

  The term transition metal (sometimes also called a transition element) has two possible meanings: The IUPAC definition[1] states that

Group 2 Period 2 4 Be 3 12 Mg 4 20 Ca 5 38 Sr 6 56 Ba 7 88Ra

Important Link:  Periodic Table (Learner.org) The periodic table (or, more formally, the periodic table of the elements or periodic table