Isotopes and percent abundance

What can you conclude about carbon-14 from its name?

• It has 14 electrons
• it has 14 neutrons
• it has 14 protons
• it has an atomic mass of 14 u

In isotopic notation, what number is on top?

• mass number

• atomic number

• element

• isotope number

If a hydrogen atom has 1 proton, 1 electron, and 1 neutron, its atomic number is:

• 1
• 2
• 3

Isotopes of an element have a different number of...

• Protons

• Neutrons

• Electrons

• Mass

Rubidium has two common isotopes, ⁸⁵Rb and ⁸⁷Rb. If the abundance of ⁸⁵Rb is 72.2% and the abundance of ⁸⁷Rb is 27.8%, what is the average atomic mass of rubidium?

• 85.468 amu

• 37 amu

• 85.6 amu

• 86.4 amu

What do carbon-12 and carbon-14 have in common?

• they have same number of protons
• they have the same number of neutrons
• they have the same atomic mass
• they have the same atomic weight

How many neutrons does the isotope of lithium have?

• 8
• 3
• 5

What is the name of the atom pictured here?

• Nitrogen
• Nitrogen-15
• Nitrogen-7
• Nitrogen-8

An isotope has three forms.  10% have a mass of 4 amu, 20% have a mass of 5 amu and 70% have a mass of 6 amu.  

Based on the percentage of abundances above, the average atomic mass will be closest to...

• 3 amu

• 4 amu

• 5 amu

• 6 amu

• None of the above

In isotopic notation, what number is on the bottom?

• mass number

• atomic number

• element

• isotope number