Unit 2.0 Review Atoms, Periodic Table, Bohr Diagram, Lewis dot

Parts of the atom

Multiple Choice

What is the charge of a Krypton nucleus?

• 84

• 36

• -84

• +36

Multiple Choice

What is the charge of the nucleus of a Beryllium atom?

• 9.012

• +4

• -4

• -9.012

Atoms, Elements, and Trends.

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Understanding the periodic table

The whole number at the top, represents the number of protons, as well as the number of electrons in a balanced atom.

This number is called the atomic number. ​

Multiple Choice

How many protons does helium have?

• 2

• 4

• 0.003

• 2.003

Multiple Choice

How many electrons does helium have?

• 2

• 4

• 0.003

• 2.003

Multiple Choice

How many protons does calcium have?

• 40

• 60

• 20

• none

Multiple Choice

How many electrons does calcium have?

• 40

• 60

• 20

• none

The atomic mass is a decimal.
To find the neutrons of an atom, round the decimal to the nearest whole number and subtract the atomic number.

Rounded atomic mass-atomic number=neutrons

Multiple Choice

In order for me to find the number of neutrons, I must round the atomic mass and then do what?

• atomic number-atomic mass
• atomic number x atomic mass
• atomic mass + atomic number
• atomic mass - atomic number

Multiple Choice

How many neutrons does Lithium have?

• 3

• 3.94

• 6.94

• 4

Multiple Choice

How many neutrons does Oxygen have?

• 8

• 7.599

• 15.599

• .599

Multiple Choice

How many neutrons are in Magnesium?

• 36

• 12

• 24

• 6

Multiple Choice

Which element has the smaller atomic radius: potassium (K) or bromine (Br)?

• potassium (K)

• bromine (Br)

Multiple Choice

Which element has the greatest ionization energy: Aluminum (Al)    or    Chlorine (Cl)?

• Aluminum (Al)

• Chlorine (Cl)

Multiple Choice

Which element has the greatest electronegativity: Nitrogen (N) or Arsenic (As)?

• Nitrogen (N)

• Arsenic (As)

Multiple Choice

As you move down a group, atomic radius increases because - 

• you add more and more neutrons

• you add more and more protons

• you add more and more shells (energy levels)

• you add more atomic mass

Multiple Choice

As you move across the periodic table from left to right, the atomic radius decreases.  This is because - 

• the number of protons increases, so attraction to electrons increases

• the number of energy levels increases

• the number of electrons increases

• the atomic mass increases

Multiple Choice

Francium (Fr) has the lowest ionization energy in Group 1 because - 

• it has the smallest number of valence electrons

• it has the greatest atomic mass

• it has the greatest number of protons, so it attracts its electrons the strongest

• its 1 valence electron is very far from the nucleus, so little energy is needed to remove it

Bohr Models

Multiple Choice

What is a Bohr Model?

• a simplified representation of an atom

• vertical column in periodic table

• horizontal row in periodic table

• Only shows the element symbol and it's outer most electron shell

Multiple Choice

What is the atomic number of this element?

• 17

• 18

• 35

• 35.453

Multiple Choice

This is the location of electrons in an atom.

• nucleus

• protons

• orbitals

• neutrons

Multiple Choice

What is a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

Multiple Choice

How many valence electrons?

• 5

• 6

• 7

• 8

Multiple Choice

Which row (period) of the Periodic Table must this element come from?

• 1

• 2

• 3

• 4

Multiple Choice

How many electrons can go in the second shell (energy) level of a Bohr diagram?

• 1

• 2

• 8

• 9

Multiple Choice

How many electrons can fit on the 1st energy level (orbital) for any Bohr Model?

• 2

• 6

• 8

• 10

Multiple Choice

How many valence (outer) electrons does Chlorine have?

• 7

• 8

• 2

• 3

Multiple Choice

Which is the correct Bohr Diagram for Lithium?

Multiple Choice

Which Bohr model represents Be?

What are Lewis Dot Structures? What can they tell us?

• How many BONDS an atom can make

• How many VALENCE ELECTRONS an atom has

Multiple Choice

Recap: What are Valence Electrons?

• Inner most electrons

• Outer most electrons

• Electrons that only form bonds

Valence Electrons

• Are the outer most electrons of an atom

• They are usually represented by what group an atom is in

Groups

Groups go UP AND DOWN. There are 18 groups total on the periodic table. Groups have names known as families

What do group numbers tell us?

Each group number tells us the number of valence electrons, which tell us the Lewis Dot Structure of an atom

Multiple Choice

You can use the _______ to tell you information about the atom's Lewis Dot Structure

• Group number

• Period number

• Name

Multiple Choice

Which structure belongs to group 14?

Multiple Choice

This could be the dot diagram of

• Mg

• Cl

• C

• O

Multiple Choice

How many electrons should Carbon have around its Lewis dot model?

• 1
• 3
• 4
• 5

Multiple Choice

This is a correct dot diagram for oxygen (O)?

• true

• false

Nuclear Chemistry

When we name an isotope we use its element name and its atomic mass

Examples: Oxygen-16, Oxygen-17 and Oxygen 18

In isotopes, the number of neutrons changes. You need to subtract the atomic number, from the atomic mass. 17-8=9 neutrons

Neutrons

the number of protons and electrons are the same from the periodic table. 8 protons, and 8 electrons.

Protons and electrons

Oxygen-17

Multiple Choice

How many protons and electrons are in Oxygen-17 and Oxygen-18

• 8 electrons and 8 protons

• 17 electrons and 17 protons

• 8 protons and 17 electrons

• impossible to tell.

Multiple Choice

How many neutrons are in Oxygen-18

• 8

• 10

• 18

• 9

Multiple Choice

In terms of neutrons, why does Carbon-14 have a larger mass than Carbon-13

• Carbon 14 has 8 neutrons and Carbon-13 has 7

• They don't have a difference in mass

• Carbon 14 and Carbon 13 have the same number of neutrons

• Carbon 14 has more protons.

Multiple Choice

The process of combining the nuclei of atoms to make different atoms is called _________?

• Fission

• Nuclear Reaction

• Fusion

• Particle Accelerator

Multiple Choice

Breaking up the nucleus of an atom is called _________?

• Fusion

• Nuclear Reaction

• Fission

• Particle Accelerator

Multiple Select

Which of the following correctly display nuclear fusion?

Multiple Choice

What is true about nuclear fusion? 

• The mass of the product is less than that of the original nucleus
• The mass of the product is 100 times less than that of the original nucleus
• The mass of the product is the same as that of the original nucleus
• The mass of the product is greater than that of the original nucleus

Find the Missing Product to Balance Nuclear Equations

Do not use the mass on the periodic table

Use the periodic table to find the missing product

Use the mass number given -
Am - 241

General Rule: Subtract the numbers on the right side of the equation from thenumbers on the left side of the equation

Multiple Choice

Complete the nuclear reaction

₂₇⁶⁰Co --> ___ + _-1⁰e

• ₂₅⁵⁶Mn

• ₂₈⁶⁰Ni

• ₂₃⁵⁸V

• ₂₇⁵⁹Co

Multiple Choice

Solve this equation for alpha decay.
²⁰⁹₈₅At = ___ + ⁴₂He

• ²⁰⁵₈₃Bi
• ²⁰⁹₈₆Rn
• ²⁰⁷₈₁Tl
• ²⁰⁸₈₅At

Multiple Choice

What is the missing isotope that will balance the following nuclear equation?
⁹₄Be  +  ¹₁H →  _____  +  ⁴₂He

• ¹⁰₅B
• ¹⁰₅Ne
• ⁶₃Li
• ⁶₃C

Starts with 1 neutron and ends with 3. Breaks up a larger, heavier nucleus into 2 or more lighter ones.

Fission

Always takes two light elements and makes a heavier one.

Fusion

Fission vs. Fusion

Multiple Choice

What element is the ?

• Ag-115
• Cd-115
• Pd-115
• Not Listed

Multiple Choice

Which equation correctly represents the alpha decay of polonium-214?

• A

• B

• C

• D

Multiple Choice

Solve this equation for beta decay.
₆¹⁴C = ___ + _-1⁰e

• ₄¹⁰Be

• ₇¹⁴N

• ₇¹⁴Si

• ₆¹³C

• ₅¹⁴B

Half Life and Half Life Calculations

• Half Life- time it takes for half

of the radioactive sample to
decay.
– Ranges from a fraction of a

second to billions of years

Multiple Choice

Using the graph, determine the half life of the isotope.

• 50

• 35

• 4

• 40

1. Calculate the number of 1/2 lives past.

2. Make a chart

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​Calculating remaining isotope

Multiple Choice

What is a half life?

• A slightly boring life

• The amount of time it takes for 1/2 of a radioactive isotope to decay

• A period of time when one is not productive

• A state of being in between two different stages