Atomic Mass Review

Can you complete a chart with the correct element name, chemical symbol, atomic number, and atomic mass like you did on your Calculating Subatomic Particles worksheet?

• Yes

• Not yet.

• I will by the time I take the quiz.

• Nope

Tags

NGSS.MS-PS1-1

Which statement best describes how the average atomic mass of an element is determined?

• By adding the masses of all atoms of the element

• By using the mass of the most common isotope only

• By calculating the weighted average of the masses of its isotopes based on their natural abundances

• By measuring the mass of the element in a laboratory

Which of the following statements best describes isotopes?

• Atoms with the same number of neutrons but different numbers of protons

• Atoms with the same number of protons but different numbers of neutrons

• Atoms with different numbers of electrons and protons

• Atoms with the same number of electrons but different numbers of protons

Tags

NGSS.HS-PS1-8

What is the standard unit for measuring the mass of a single atom?

• grams

• atomic mass units

• moles

• liters

Magnesium has three stable isotopes: Mg-24, Mg-25, and Mg-26. If Mg-24 has an abundance of 79%, Mg-25 has an abundance of 10%, and Mg-26 has an abundance of 11%, what is the average atomic mass of magnesium?

• 24.3 amu

• 25.0 amu

• 26.0 amu

• 79.0 amu

If the atomic mass is the combination of mass from protons and neutrons, why do elements on the periodic table have decimals instead of whole numbers?

• Because atomic masses are averages based on the natural abundance of isotopes.

• Because protons and neutrons have decimal masses.

• Because electrons contribute significantly to atomic mass.

• Because atomic masses are rounded for simplicity.

Tags

NGSS.HS-PS1-8

Oxygen has three naturally occurring isotopes: Oxygen-16 with an abundance of 99.76%, Oxygen-17 with an abundance of 0.04%, and Oxygen-18 with an abundance of 0.20%. Calculate the average atomic mass of oxygen.

• 16.00 amu

• 17.00 amu

• 16.01 amu

• 18.00 amu

Complete this radioactive decay equation and identify the type of decay shown.

14/6 C → ______ + 0/-1 β

Type of decay: ______

• 14/6 C → 14/7 N + 0/-1 β Type of decay: Beta decay

• 14/6 C → 13/6 C + 0/-1 β Type of decay: Alpha decay

• 14/6 C → 15/7 N + 0/-1 β Type of decay: Gamma decay

• 14/6 C → 14/5 B + 0/-1 β Type of decay: Beta decay

Tags

NGSS.HS-PS1-8

Complete this radioactive decay equation and identify the type of decay shown.

210/84 Po → 206/82 Pb + ______

Type of decay: ______

• 210/84 Po → 206/82 Pb + 4/2 He Type of decay: Alpha decay

• 210/84 Po → 206/82 Pb + 0/-1 e Type of decay: Beta decay

• 210/84 Po → 206/82 Pb + 1/0 n Type of decay: Neutron emission

• 210/84 Po → 206/82 Pb + 0/0 γ Type of decay: Gamma decay

Tags

NGSS.HS-PS1-8

Carbon-12 and Carbon-14 are examples of...

• atoms

• ions

• isotopes