Atomic Number Z the number of protons in the nucleus of an atom A Z X Example

Atomic number z the number of protons in the nucleus

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Atomic Number (Z)- the number of protons in the nucleus of an atom. A Z X Example: Carbon= 12 6 C (mass number=6, atomic number=12) Atomic Weight- weighted average of the masses (in amu) Isotopes Atoms of the same element that have a different number of neutrons Carbon-12, Carbon-13, Carbon-14 Atomic Number (Z)- the number of protons in the nucleus of an atom. Which have 12, 13, 14 neutrons but all have 12 protons and 12 electrons Periodic Table Lists and organizes every element in boxes, each element is assigned a chemical symbol, which is one or two letters. The elements are arranged in order of their
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atomic numbers, as you go across, each element has one more electron and one more proton. (increasing) Period- a row of elements across the periodic table Group (family)- a column of elements in the periodic table. Groups of elements have similar physical and chemical properties. Three classes of elements Metals- they are solid at room temperature (except for mercury, which is a liquid), shiny, conductors of electricity and heat, ductile (they can be drawn into wires) and malleable (they can be hammered and rolled into sheets). Only 24 elements are not metal. Left side of te periodic table.
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