Unit #3 Atomic Structure Review

Fill in the blanks:

_____________ stability = ________________ Potential Energy

• increased, unchanged

• decreased, decreased

• increased, decreased

• chemical, increased

Deflections of the beam in a cathode ray tube demonstrated that all atoms contained 

• a dense positive nucleus
• negatively charged electrons
• neutral particles called neutrons
• photons of light

Tags

NGSS.HS-PS1-1

Dalton proposed that atoms are

• indivisible particles
• like plum pudding
• like a solar system
• imaginary

Tags

NGSS.HS-PS1-7

According to the isotope notation shown below, how many neutrons does lithium have?

• 3
• 4
• 7
• 10

Tags

NGSS.HS-PS1-8

Calculate the average atomic mass of an element using the data table below

• 35.45 amu
• 35.426 amu
• 35.5 amu
• 35.4215 amu

How many protons, neutrons, and electrons are present in ⁷²As^3-?

• 72p+ , 72n , 69e-
• 33p+ , 30n , 33e-
• 33p+ , 39n , 36e -
• 33p+ , 39n , 30e-

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Determine the atomic number, mass number, number of protons, neutrons, and electrons for a neutral atom of potassium-39.

• Atomic # 19

  Mass # 39

  Protons 19

  Neutrons 20

  Electrons 19

• Atomic # 19

  Mass # 39.098

  Protons 19

  Neutrons 19

  Electrons 19

• Atomic # 39

  Mass # 19

  Protons 39

  Neutrons 19

  Electrons 39

• Atomic # 19

  Mass # 39.098

  Protons 19

  Neutrons 20

  Electrons 19

Tags

NGSS.MS-PS1-1

What does the number 84 in krypton-84 represent?

• the atomic number

• the mass number

• the sum of the protons and electrons

• twice the number of protons

Tags

NGSS.HS-PS1-8

Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 22.0 is 65.0% abundant; the isotope with a mass number of 24.0 is 35.0% abundant. What is the average atomic mass for element Z?

• 19.9 amu

• 22.7 amu

• 23 amu

• 23.3 amu

Gallium has two naturally occurring isotopes. The mass of gallium-69 is 68.9256 amu and it is 60.108% abundant. The mass of gallium-71 is 70.9247 amu and it is 39.892% abundant. Calculate the atomic mass of gallium.

• 4958.8597 amu

• 6972.3081 amu

• 70.0928 amu

• 69.7231 amu