Average Atomic Mass

What mass number?

• total number of electrons of an element

• total number of protons and neutrons of an element

• the average atomic mass of an element

• the total number of protons of an element

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112.35.c.6.C

Convert 90% to decimal format:

• 0.090

• 90.0

• 0.90

• 9

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112.35.c.6.C

You discover an atom that has 17 protons. What element is this?

• oxygen

• hydrogen

• chlorine

• carbon

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112.35.c.6.C

Isotopes are atoms of the same element that have different ...?

• neutrons

• charges

• numbers of electrons

• atomic numbers

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112.35.c.6.C

What is percent abundance?

• the percentage by mass of each element in a compound

• the percentage of how often an element's isotope naturally appears on the earth

• the percentage of protons relative to neutrons in an atom

• the percentage of how often an element is found on the earth compared to other elements

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112.35.c.6.C

Choose the response that is 15% converted into decimal format

• 1500

• 0.15

• 15.0

• 15%

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112.35.c.6.C

Which is the formula for calculating average atomic mass for an element having two isotopes?

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112.35.c.6.C

The table shows the two isotopes of an unknown element. What is the average atomic mass of the unknown element?

• 5.40 amu

• 10.5 amu

• 10.8 amu

• 11.0 amu

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112.35.c.6.C

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

• 85.556 amu

• 86 amu

• 172 amu

• 7,481.645 amu

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112.35.c.6.C

What makes an element unique?

• the number of electrons

• the number of neutrons

• the charge of the element

• the number of protons

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112.35.c.6.C