Isotopes and Atomic Mass

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

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

Isotopes are atoms of the same element with different numbers of __________ & therefore different __________.

• n⁰ ;  atomic #’s
• p⁺ ; atomic #’s
• e^- ; atomic masses
• n⁰ ; atomic masses

Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons.

• true
• false

What is the atomic mass of the pictured isotope?

• 17
• 35
• 18
• What a "clorious" isotope!

What do these isotopes of carbon all have in common?

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

There are two primary isotopes found in any sample of copper: copper-63 and copper-65. The isotope ⁶⁵Cu composes 69.2% of the sample and ⁶³Cu comprises the other 30.8%. Based on this data, what is the atomic mass of copper?

• 29 amu

• 63.546 amu

• 64.4 amu

• 63.6 amu

_______ is the average mass of all the isotopes of an element.

• Atomic Mass

• Atomic Number

• Chemical Symbol

• Element Name

Which notation is correct for this isotope of osmium that has 76 protons and 114 neutrons?

• Osmium-114

• Osmium-76

• Osmium-190

• Osmium-190.23

How do you calculate mass number?

• Mass x percent

• Protons + Electrons

• Protons + Neutrons

• Neutrons + Protons + Electrons