Honors Atomic Structure (Topic 1A + B)

Determine the p⁺, n⁰, and e^- respectively in an Iodine-125 atom.

• 53, 74, 53

• 53, 125, 52

• 53, 72, 52

• 53, 72, 53

How does the mass of an electron compare to that of a proton?

• an electron is much heavier than a proton

• the mass of an electron is equal to that of a proton

• An electron has no mass

  
  

• an electron is much lighter than a proton

How many protons, neutrons and electrons are present in the accompanying chemical symbol.

• 34, 45, 36

  
  

• 34, 79, 36

  
  

• 34, 45, 32

  
  

• 34, 79, 32

  
  

What is the chemical symbol for the ion with 82 p⁺, 127 n⁰, and 78 e^-?

• ²⁰⁷Pb⁴⁺

  
  

• ²⁰⁹Pb⁴⁺

  
  

• ²⁰⁹Pb^4-

  
  

• ²⁰⁷Pb^4-

  
  

This physicist is credited with discovering the electron through the use of a cathode ray tube.

• John Dalton

  
  

• JJ Thomson

  
  

• Niels Bohr

  
  

• Sir James Chadwick

  
  

If a neutral atom has 8 protons and 10 neutrons, what is its ground state electron configuration?

• 1s² 2s² 2p² 3s²

  
  

• 1s² 2s² 3p⁴

  
  

• 1s² 2s² 2p⁶

  
  

• 1s² 2s² 2p⁴

  
  

Which atom has a completely filled 3rd principal energy level?

• Ar

• K

• Zn

• Ca

Which could be represented by the accompanying orbital diagram?

• O

• Si²⁺

• Cl⁺

• S^2-

How many valence electrons are found in a C^2- ion?

• 2

• 4

• 6

• 8

What particle determines the chemical identity of an element?

• electron

• proton

• neutron

• alpha particle