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Structure of Matter

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  • What charge do neutrons have?
    neutral or no charge
  • What physical state are most of the elements?
    solids
  • What is the smallest part of an element, made of electrons, protons and neutrons?
    atom
  • What is different about the Noble Gases compared to the other elements?
    not reactive
  • What is the atomic number the same as?
    protons
  • What is the charge of an atom that has an equal number of protons and electrons?
    neutral
  • How is the Periodic Table arranged?
    by atomic number
  • If an element has 20 protons and an atomic mass of 40, how many neutrons does it have?
    20
  • Two or more different atoms bonded together
    compound
  • What is the simplest unit of a compound?
    molecule
  • Which group of elements are known for being soft enough to cut with a knife?
    alkali metals
  • How many electrons can the first energy level hold?
    2
  • What is the current model of the atom that states electrons are in a cloud?
    electron cloud model
  • formed when 2 or more atoms join together chemically
    molecule
  • At what temperatures will metalloids act as a metal?
    high
  • What is a pure substance made of only 1 type of atom?
    element
  • What are the halogens known for making?
    salt formers
  • What charge do protons have?
    positive
  • How many carbon elements make up caffeine, C8H10N4O2?
    8
  • Anything that has mass and takes up space
    matter
  • What is true about the alkaline earth metals, group 2 elements?
    less reactive than the alkalis
  • Where is most of the mass of an atom?
    nucleus
  • When molecules or atoms arrange themselves in ordered patterns create this.
    crystals
  • What are the large group of elements (groups 3-12) in the main part of the table called?
    transition metals
  • This is what the subscript tells you in a chemical formula.
    the number of atoms of an element
  • Made up of a single substance, either an element or compound, with a definite composition and set of chemical and physical properties
    pure substance
  • What state of matter are most non-metals at room temperature?
    gases
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