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Chemistry Past Questions

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2381
What is the atomic number of an element whose cation Y+ has the electronic configuration 1s22s22p6?
  • A. 9
  • B. 10
  • C. 11
  • D. 12
View Answer & Discuss (16) WAEC 2008
2382

Atom \(^{234} _{88} Q\) decay by alpha emission to give an atom R. The atomic number and mass number of atom R are respectively

  • A. 86 and 230
  • B. 87 and 234
  • C. 88 and 233
  • D. 90 and 238
View Answer & Discuss (5) WAEC 2008
2383
Which of the following statements is not true of halogens?
  • A. they exist in different physical states
  • B. they exist as diatomic molecules
  • C. their ionic radii decrease down the group
  • D. their melting and bolling points increase down the group
View Answer & Discuss (1) WAEC 2008
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2384
Elements in the same group of the periodic table have
  • A. the same number of valence electrons
  • B. the same number of electron shells
  • C. different chemical behaviour
  • D. the same atomic size
View Answer & Discuss WAEC 2008
2385
Consider the following elements and their electronic configurations
W: 1s22s2
X: 1s 22s22p6
Y: 1s22s22p63s2
Z: 1s22s22p63s23p2. Which of the elements belong to the same group in the periodic table?
  • A. W and X only
  • B. Y and Z only
  • C. W and Y only
  • D. W, Y and Z only
View Answer & Discuss (3) WAEC 2008
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