WAEC 2012 : Chemistry

1The number of orbitals in a p-sub level of an atom is

  • A. 2
  • B. 3
  • C. 5
  • D. 6
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2Which of the following electron configurations represents that of an atom in its ground state

  • A. 1s 22s12p1
  • B. 1s22s22p63s13p1
  • C. 1s22s12p3
  • D. 1s22s22p63so
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3Which of the following ions has an electron configuration different from the other

  • A. 17CI-
  • B. 8O2-
  • C. 12Mg2+
  • D. 13AI3+
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4The atomic radii of metals are usually

  • A. greater than their ionic radii
  • B. equal to their ionic radii
  • C. less than their ionic radii
  • D. less than those of non-metals in the same period
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5Two elements, X and Y are in the same group on the periodic table because they both have the same

  • A. number of electronic shells
  • B. number of valence electrons
  • C. atomic size
  • D. atomic number
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