CH B Chemistry L3 Periodic Table

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  1. 4. Table of Elements, A system of organization for the elements. Elements are positioned based on their atomic number and type. The table lists information about each element including atomic number, atomic mass, and symbol.
  2. 7. The name for a row on the periodic table of elements. Periods are determined by the highest energy level where electrons can be found in an atom of that element. Elements found in the lower periods of the periodic table have a much higher energy than those found in the upper periods.
  3. 9. one of the three broad categories of elements. Good conductors of electricity and have metallic sheen. They can be molded or stretched without breaking. They include all Alkali metals (group IA), the alkaline earth metals (group IIA), and the transition and inner-transition metals (group B).
  4. 10. A letter or abbreviation for an element.
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  1. 1. The name of the column in the periodic table of elements. Groups are generally divided on the number of valence electrons in an atom of the element.
  2. 2. number, The number of protons contained in an atom. Each element has its own invariable atomic number. The atomic number is often used to identify the elements.
  3. 3. one of the three broad categories of elements. They have no solid form, do not gleam, are poor conductors, and tend to be fragile. Examples include Hydrogen, the halogen gases (group VIIA), the chalcogens (VIA), and the noble gases (group VIIIA).
  4. 5. A variation of an element based on the number of neutrons in its nucleus. Neutrons do not affect the number of electrons and protons for the atomic number in an element because neutrons have no electric charge.
  5. 6. one of the three broad categories of elements. Also called semimetals or semiconductors. Have metallic gleam of metals, but are more fragile. They can conduct heat and electricity, but not as well as metals. Examples: boron, silicon, arsenic
  6. 8. mass, the total average number of protons and neutrons in an atom. It is measured in atomic mass units. Protons + neutrons in the nucleus