Isotope Review

Which of the following atoms is an isotope of Lithium?

• an atom with

  4 protons

  3 neutrons

• An atom with 4 protons and an atomic mass of 6.941 amu

• an atom with 7 protons and 3 neutrons

• an atom with 3 protons and 5 neutrons

Tags

NGSS.HS-PS1-8

What is the mass number of the isotope Iodine-131

• 131

• 53

• 126.904

• 127

Which of the following atoms represents an isotope of the element Lithium?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

Which of the following is the correct isotope symbol for the atom with 25 protons and 27 neutrons?

• 55

  Mn

  25

• 25

  Mg

  27

• 27

  Co

  25

• 52

  Mn

  25

Tags

NGSS.MS-PS1-1

Phosphorus-32 is used as a tracer in plants to detect how well the plant absorbs fertilizer. How many protons and neutrons does P-32 have?

• 15 P

  16 N

• 15 P

  17 N

• 32 P

  15 N

• 15 P

  32 N

Tags

NGSS.MS-PS1-1

Chromium has 2 stable isotopes: Cr-52 and Cr-53. Chromium's atomic mass is 51.996. Which of chromium's 2 stable isotopes is the most abundant?

• Cr-52

• Cr-53

• Not enough information to be determined

• Cr-51

Ling is trying to calculate the atomic mass for the element potassium (K). Potassium-39 has an atomic mass of 38.96371 and a percent abundance of 93.258%. Potassium-41 has an atomic mass of 40.96183 and a percent abundance of 6.730%. Which of the following is the correct way to calculate the atomic mass?

• (38.96371)(93.258) + (40.96183)(6.730)

• (38.96371 + 40.96183) / 2

• (38.96371)(.93258) + (40.96183)(0.6730)

• (38.96371)(0.93258) + (40.96183)(0.06730)

Which of the following isotopes has 35 neutrons?

• 6

  He

  2

• U-240

• Co-62

• 33

  Cl

  17

Tags

NGSS.HS-PS1-8

Which of the following isotopes has the greatest number of electrons?

• 211

  Tl

  81

• Pb-213

• 206

  Hg

  80

• Lead-208

• 207

  Bi

  83

Tags

NGSS.MS-PS1-1

Choose the correct isotope symbol for the atom that contains 33 electrons and 31 neutrons.

• 33

  As

  31

• 64

  As

  33

• 31

  Ga

  33

• 64

  Ga

  31

Tags

NGSS.MS-PS1-1