Isotopes

Which is not a positive use of radiosotopes?

• smoke detectors

• inspections

• military weapon

• medical research and treatment

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

Tags

NGSS.MS-PS1-1

In a correctly written symbol what would be located in the "A" position?

• number of neutrons
• atomic number
• number of electrons 
• mass number

Tags

NGSS.MS-PS1-1

What quantities vary between isotopes of an element?

• protons, electrons, and atomic mass
• protons, electrons, and atomic number
• neutrons and electrons
• neutrons and atomic mass

Tags

NGSS.HS-PS1-8

Which radioisotope is used for studying blood circulation?

• C-14

• Na-24

• I-131

• Co-60

Isotopes are atoms of the same element with different #’s of __________ & therefore different __________.

• n⁰ ; atomic numbers

• p⁺ ; atomic numbers

• e^- ; atomic masses

• n⁰ ; atomic masses

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

• 74.92 amu
• 24.97 amu
• 75.01 amu
• 74.51 amu

An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to

• 2 amu
• 3 amu
• 4 amu
• 5 amu

Which radioisotope is used for radiotherapy (i.e. the use of radiation to cure or prevent cancer)?

• Co-60

• Ir-192

• C-14

• U-235