Unit 2 Review - Section 1Atomic Structure and Mass

Which subatomic particles are responsible for…

Element identity?Mass?

Charge?Chemical Behavior?

Which subatomic particles are responsible for…

Element identity? ProtonsMass? Protons and neutrons

Charge? Protons and electronsChemical Behavior? electrons

Which subatomic particles are found in the nucleus?

Which subatomic particles are found in the nucleus?

Protons and neutrons

Which subatomic particles have the smallest mass?

Which subatomic particles have the smallest mass?

Electrons

Which subatomic particles have a positive charge?

Which subatomic particles have a positive charge?Protons

Isotopes have the same number of protons, but different numbers of ________________.

Isotopes have the same number of protons, but different numbers of Neutrons

When you add up the protons and neutrons, do you getthe mass number or

the average atomic mass?

When you add up the protons and neutrons, do you getthe mass number or

the average atomic mass? Mass number

Which is found in the periodic table,the mass number or

the average atomic mass?

Which is found in the periodic table,the mass number or

the average atomic mass? Average atomic mass

An atom has 26 protons, 30 neutrons, and 26 electrons.

What is its atomic number?What is its mass number?

An atom has 26 protons, 30 neutrons, and 26 electrons.

What is its atomic number? 26What is its mass number? 56

An atom has 7 protons, 8 neutrons, and 7 electrons.

What element is it? What is its mass number?

An atom has 7 protons, 8 neutrons, and 7 electrons.

What is its atomic number? nitrogenWhat is its mass number? 15

For the isotope bromine-79,what is its mass number?

what is its atomic number?how many neutrons does it have?

For the isotope bromine-79,what is its mass number? 79

what is its atomic number? 35how many neutrons does it have? 44

For the isotope copper-64,how many neutrons does it have?

For the isotope copper-64,how many neutrons does it have? 35

For the isotope sodium-24,how many neutrons does it have?

For the isotope sodium-24,how many neutrons does it have? 13

For the isotope lithium-7,how many neutrons does it have?

For the isotope lithium-7,how many neutrons does it have? 4

For the isotope silver-109,write the isotope symbol?

For the isotope silver-109,write the isotope symbol?

Ag109

47

For the isotope potassium-41,write the isotope symbol?

For the isotope potassium-41,write the isotope symbol?

K41

19

For the isotope symbol below,write the isotope name?

Br81

35

For the isotope symbol below,write the isotope name?

Br81

35

Bromine-81

For the isotope symbol below,write the isotope name?

U238

92

For the isotope symbol below,write the isotope name?

U238

92

Uranium-238

Lithium has two naturally occurring isotopes. Using the information below, calculate the average atomic mass of lithium.

lithium-6 (mass = 6.01 amu, abundance = 7.6%) andlithium-7 (mass = 7.02 amu, abundance = 92.4%).

Lithium has two naturally occurring isotopes. Using the information below, calculate the average atomic mass of lithium.

lithium-6 (mass = 6.01 amu, abundance = 7.6%) andlithium-7 (mass = 7.02 amu, abundance = 92.4%).

Hint: First calculate the mass contributions of each isotope!

Lithium has two naturally occurring isotopes. Using the information below, calculate the average atomic mass of lithium.

lithium-6 (mass = 6.01 amu, abundance = 7.6%) andlithium-7 (mass = 7.02 amu, abundance = 92.4%).

Lithium-6: 6.01 amu x 0.076 = 0.46 amuLithium-7: 7.02 amu x 0.924 = 6.49 amu

Avg atomic mass = 0.46 + 6.49 =6.94 amu

For more practice…

• http://www.sciencegeek.net/Chemistry/taters/Unit1Numbers2.htm

• http://www.sciencegeek.net/Chemistry/taters/Unit1AtomicNumbers.htm