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October Exam Revision

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  • Liquid non-metal element
    Bromine
  • Elements of the same group have similar properties (GR)
    Because all have the same number of electrons in outermost energy level
  • The elements of p-block begins with .......... group and ends with ........... group
    3A  -  Zero
  • The valency of inert gases is zero (GR)
    Because their outermost energy level is completely filled
  • Liquid metal element
    Mercury
  • Thebuilding unit of matter
    Atoms
  • Substance its molecules consist of similar atoms 
    Element
  • The outermost energy level of metals contains ............... electrons but non-metals contains ............... electrons
    less than 4  -  more than 4
  • Mosely arranged elements according to atomic number not atomic mass (GR)
    Because properties of elements related to atomic number not atomic mass
  • Mass number is always graeter than atomic number (GR)
    Because mass number is the number of protons and neutrons but atomic number is protons only
  • Substance its molecules consist of different atoms
    Compound
  • The atom is electrically neutral (GR)
    Because number of positive protons = number of negative electrons
  • mixture its components can not be distingushed by naked eye
    Homogeneous mixture
  • A group of gases of zero gtoup
    Inert gases
  • Substance consists of two or more substances not chemically combined
    Mixture
  • Scientist who arranged elements according to atomic mass
    Mendleeve
  • S-block is found on the ............. side of periodic table and consists of .......... groups
    left - 2
  • The M level is filled with electrons before N level (GR)
    because energy of M is less than energy of N
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