DE_Chem_2.1.2-5

DE_Chem_2.1.1

​What's different about these three isotopes?

Hydrogen Isotopes

Open Ended

How are these three hydrogen isotopes different?

DE_Chem_2.1.2_How Can Isotopes of a Given Element Be Identified?

DE_Chem_2.1.2-5

DE_Chem_2.1.3_How Can the Quantity of Protons, Neutrons, and Electrons in an Atom Be Determined?

Protons = 1 amu
Neutrons = 1 amu
Electrons = negligible

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​Atomic Mass Unit (amu)

​​Symbol with atomic mass and number

​​Element with atomic mass only

DE_Chem_2.1.4_What Is the Difference between Atomic Mass and Atomic Number?

What is listed in the Periodic Table

It is a weighted average mass of a particular element

​Average Atomic Mass

DE_Chem_2.1.5_How Can the Average Atomic Mass for an Element be Determined Given the Masses of its Isotopes and their Relative Abundance?

1. multiply (%abundance)(mass of isotope) for each isotope

2. add them all

3. divide by 100

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Match the following

• the weighted average of the atomic mass of each isotope of the element, in proportion to the percentage of each isotope of the element occurring in nature

• the total number of neutrons and protons in an atom

• the number of protons in the nucleus of an atom

Atomic mass

Mass number

Atomic number

• Atomic mass

• Mass number

• Atomic number