Unit 2 Test Review

What atom matches this electron configuration?

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc

• Copper

• Nickel

• Germanium

An atom has an atomic number of 8 and a charge of -2. How many electrons does the atom have?

• 8

• 10

• 6

• 2

Who discovered the nucleus of the atom through the Gold Foil Experiment?

• Rutherford

• Bohr

• Thomson

• Dalton

How many electrons does this copper atom have?

• 63

• 29

• 92

• 34

Balance the following nuclear equation:

⁹₄Be + ¹₁H → _____ + ⁴₂He

• ¹⁰₅B

• ¹⁰₅Ne

• ⁶₃Li

• ¹⁴₇N

Which electron configuration belongs to chlorine (Cl)?

• 1s² 2s² 2p⁶ 3s² 3p⁵

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁶ 3s² 3p⁷

What is the atomic number of an element with 41 neutrons and a mass number of 80?

• 39

• 41

• 80

• 121

If 10.0 mg of iodine-131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 1.25 mg

• 2.50 mg

• 10.0 mg

• 0.750 mg

Balance the following nuclear equation:

¹⁴₆C → ⁰_-1e + ________

• ¹⁴₅B

• ¹⁴₆C

• ¹⁴₇N

• ⁴₂He

How many neutrons does this isotope of lithium have?

• 8

• 3

• 4

• 5