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periodic table of element

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  • An alkali element in Period 2, its atomic number is equal to:
    3 (Lithium)
  • Elements in the same period have similar chemical properties (true or false)
    False
  • The atomic radius in a group increases with increasing atomic number (true or false)
    true
  • The atomic number of the noble gas in Period 2 is
    10 (Neon)
  • If the last energy level of a halogen element is L, its atomic number is
    9
  • An element in Period 3 and Group 3A, with 14 neutrons in its nucleus, its mass number is:
    27 (Aluminum)
  • The valency of argon is:
    zero
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