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Chemistry 1989 JAMB Past Questions

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6
The atomic radius of Li, Na and K are 1: 33A, 1. 54A and 1. 96A res pectively. Which of the following explaqins this gradation in atomic radius?
  • A. electropositivity decreases from Li to Na to K
  • B. electronegativity decreases from Li to Na to K
  • C. the number of the electron shells increases from Li to Na to K
  • D. the elements are in the same period
View Answer & Discuss (5) JAMB 1989
7

Elements X and Y have electronic configurations 1s\(^2\)2s\(^2\)2p\(^4\) and 1s\(^2\)2s\(^2\)2p\(^6\)3s\(^2\)3p\(^1\) respectively. When they combine, the formula of the compound formed is?

  • A. XY
  • B. YX
  • C. X2Y3
  • D. Y2X3
View Answer & Discuss (13) JAMB 1989
8
The atomic number of caesium is 55 and its atomic mass is 133. The nucleus of caesium atom therefore contains
  • A. 78 protons and 55 elections
  • B. 55 protons and 78 neutrons
  • C. 55 neutrons 78 electrons
  • D. 78 protons and 55 neutrons
View Answer & Discuss JAMB 1989
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9
Four elements P,Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively . Which of these electrons is a noble gas?
  • A. P
  • B. Q
  • C. R
  • D. S
View Answer & Discuss (2) JAMB 1989
10

How many valence electrons are contained in the element represented \(^{31}\) \(_{15}\)P?

  • A. 3
  • B. 5
  • C. 15
  • D. 31
View Answer & Discuss (14) JAMB 1989
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