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946

Which of the following electron configurations represents that of an atom in its ground state?

  • A. 1s 22s12p1
  • B. 1s22s22p63s13p1
  • C. 1s22s12p3
  • D. 1s22s22p63s0
View Answer & Discuss (5) WAEC 2012
947

Which of the following ions has an electron configuration different from the other?

  • A. 17CI-
  • B. 8O2-
  • C. 12Mg2+
  • D. 13AI3+
View Answer & Discuss (5) WAEC 2012
948

The 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
View Answer & Discuss (2) WAEC 2012
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949

Two 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
View Answer & Discuss WAEC 2012
950

The d-block elements are paramagnetic because they

  • A. contain paired electrons which are repelled by magnetic field
  • B. contain unpaired electrons in the partially filled 3d-orbital
  • C. contain paired electrons which are repelled by magnetic field force
  • D. have delocalized valence electrons
View Answer & Discuss WAEC 2012
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