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Atomic Structure (Grade 10)

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Atomic Structure

Instructions: Answering some of these questions requires the use of a Periodic Table. The atomic number can be located at the bottom-left corner of a Periodic Table element box.

1. 
What is the charge of the nucleus of a magnesium-24 atom?
  1. +2
  2. +24
  3. +12
  4. +36
 
2. 
What is the total number of electrons in an atom that has 7 protons and 7 neutrons?
  1. 0
  2. 7
  3. 14
  4. 1
3. 
What is the total number of electrons in an atom of Mn-55?
  1. 30
  2. 55
  3. 25
  4. 80
 
4. 
What is the atomic number of an atom with 20 protons, 20 electrons, and 22 neutrons?
  1. 42
  2. 22
  3. 2
  4. 20
5. 
What is the mass number of an atom with 11 protons, 11 electrons, and 12 neutrons?
  1. 11
  2. 23
  3. 22
  4. 1
 
6. 
What is the total number of protons in an ion with 10 electrons, a charge of +2, and an atomic number of 12?
  1. 10
  2. 9
  3. 12
  4. 2
7. 
What is the total number of neutrons in an atom with a mass number of 3 and an atomic number of 1?
  1. 3
  2. 1
  3. 2
  4. 4
 
8. 
What is the total number of neutrons in an atom of Li-7?
  1. 7
  2. 3
  3. 1
  4. 4
9. 
State how an atom of C-12 differs from an atom of C-14.



 
10. 
State one difference between the nucleus of a nitrogen-16 atom and the nucleus of an oxygen-16 atom.



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