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2471
The electron configuration of carbon atom in its excited state is [ 6C]
  • A. 1s22s 22px12py 1
  • B. 1s 2 2s 22px 22pyo
  • C. 1s12s22px12py12pz1
  • D. 1s 22s12px12py12pz1
View Answer & Discuss (3) WAEC 2009
2472
An important medical use of nuclear radiations is
  • A. activation analysis
  • B. carbon dating
  • C. radiotherapy
  • D. tissue regeneration
View Answer & Discuss (1) WAEC 2009
2473
Which of the following elements exhibits the same chemical properties as the atom \(\frac{35}{17}\)X? An element with
  • A. atomic number 17
  • B. atomic number 18
  • C. mass number 35
  • D. mass number 52
View Answer & Discuss WAEC 2009
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2474

Which of the following noble gases has electronic structure similar to that of N in NH\(_3\)? [\(^{14}_7\)N]

  • A. 2He
  • B. 10Ne
  • C. 18Ar
  • D. 36Kr
View Answer & Discuss (2) WAEC 2009
2475
Which of the following equations represents beta decay?
  • A. \(\frac{14}{7}\)N + \(\frac{4}{2}\)He → \(\frac{8}{17}\)O + \(\frac{1}{1}\)H
  • B. \(\frac{8238}{92}\)U → \(\frac{234}{90}\)Th + \(\frac{4}{2}\)He
  • C. \(\frac{8238}{92}\)U → \(\frac{239}{93}\)Np + \(\frac{0}{-1}\)e
  • D. \(\frac{13}{7}\)N + \(\frac{4}{2}\)He → \(\frac{16}{8}\)O + \(\frac{1}{1}\)H
View Answer & Discuss (2) WAEC 2010
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