Average Atomic Mass

Boron (B) has two naturally occurring isotopes: boron-10 (abundance = 19.8%, mass = 10.013 amu),

boron-11 (abundance = 80.2%, mass = 11.009 amu). Calculate the atomic mass of boron.

• 10.0 amu

• 10.2 amu

• 10.8 amu

• 11.0 amu

Use the table to calculate the atomic mass of element X. Then use the periodic table to

identify the element.

• 14.999

• 15.999

• 16.999

• 17.99

Tags

NGSS.HS-PS1-7

Using the graph and the data table, calculate the average atomic mass of the unknown element. Identify the unknown element.

• 86.20 amu

• 86.83 amu

• 86.97 amu

• 87.10 amu

Tags

NGSS.HS-PS1-7

Use the mass spectrum graph to identify the element.

• Boron

• Neon

• Nickel

• Palladium

Copper has two isotopes: Cu-63 (abundance = 69.2%, mass = 62.930 amu) and Cu-65 (abundance = 30.8%, mass = 64.928 amu). Calculate the atomic mass of copper.

• 63.0

• 63.5

• 64.0

• 64.3

Atoms of ¹⁶O, ¹⁷O, and ¹⁸O have the same number of:

• Protons, but different number of electrons

• Electrons, but a different number of protons

• Protons, but a different number of neutrons

• Neutrons, but a different number of protons

Tags

NGSS.MS-PS1-1