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Chemistry µIB
2.1a The Nuclear Atom
10 quick questions

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10 minutes maximum!

An IB Periodic Table is required. Calculators should not be used!

atom image
1. Which of the following statements is FALSE?
  • A. The nucleus of an atom contains protons and neutrons
  • B. Negatively charged electrons occupy the space outside the nucleus
  • C. Atoms contain a positively charged dense nucleus
  • D. The number of electrons in an atom equals the number of neutrons

2. Which correctly represents the relative masses of the sub atomic particles?

  Electron Proton Neutron
A 5 x 10-4 5 x 10-4 1
B 5 x 10-4 1 1
C 1 5 x 10-4 5 x 10-4
D 1 1 5 x 10-4
3. What is the atomic number of an atom which has 30 electrons and 35 neutrons?
  • A.   30
  • B.   35
  • C.   65
  • D.   105

4. How many protons, neutrons and electrons are present in each atom of 39K?

  Protons Neutrons Electrons
A 19 20 19
B 19 39 19
C 20 39 20
D 20 19 20

5. What is the correct symbol for the species which contains 13 protons, 14 neutrons and 10 electrons?

  • A.  
27 Si3+
14
 
  • B.  
27 Si
14
 
  • C.  
27 Al3+
13
 
  • D.  
24 Al+
13

6. Which of the following species are isoelectronic (contain the same number of electrons)?

    I.   16 O2-    
 8
 
    II.   24 Mg2+    
12
 
    III.  29 Si    
14
  • A.   I and II only
  • B.   I and III only
  • C.   II and III only
  • D.   I, II and III
7. Which statement about two isotopes of an element is TRUE?
  • A.   They have the same number of neutrons
  • B.   They have different numbers of electrons
  • C.   They have the same chemical properties
  • D.   The have different atomic numbers
8. A hypothetical element, X, consists of two isotopes, 50X and 54X. If 70% of the sample consists of 50X isotopes, what is the relative atomic mass of X?
  • A.   50.6
  • B.   51.0
  • C.   51.2
  • D.   52.0

9. The number of protons, electrons and neutrons in four species are given in the table below. Which two are isotopes of (neutral) atoms of the same element?

  Number of protons Number of electrons Number of neutrons
W 9 10 9
X 9 9 10
Y 10 10 9
Z 9 9 9
  • A.   W and X
  • B.   X and Z
  • C.   W and Y
  • D.   Y and Z

10. What is the relative atomic mass of the element with the mass spectrum shown below?

relative atomic mass graph

 
  • A.   11.4
  • B.   11.8
  • C.   12.0
  • D.   12.4