Loading...

Messages

Proposals

Stuck in your homework and missing deadline? Get urgent help in $10/Page with 24 hours deadline

Get Urgent Writing Help In Your Essays, Assignments, Homeworks, Dissertation, Thesis Or Coursework & Achieve A+ Grades.

Privacy Guaranteed - 100% Plagiarism Free Writing - Free Turnitin Report - Professional And Experienced Writers - 24/7 Online Support

Periodic trends homework answers

13/11/2020 Client: arwaabdullah Deadline: 24 Hours

image2.png
PERIODIC TRENDS
In the nineteenth century, Mendeleev used the chemical and physical properties of the elements to develop an arrangement of the elements that today we call the periodic table. In this lab activity, you will investigate how three properties of the elements—atomic radius, ionization energy, and electronegativity—vary according to atomic number. You will be making a 3-dimensional model of these properties for some of the representative elements, and will use it to describe and explain the trends in these properties.

Objectives

When you have completed this activity, you should be able to:

1. Use a model to describe the trends in several physical properties of the elements.

2. Relate these trends to the electron configuration of the elements.

Materials

· small plate

· scissors

· ruler

· plastic straws, 3 colors

· calculator

· ruler

· forceps

· plastic wrap

· periodic table

Procedure

1. You will prepare a 3-dimensional model for each of the properties of the elements.

2. In order to make the 3-D model, you need to cut the straws to scale so their heights represent the relative values for each element. On the Data Table provided, convert the values for your assigned property to a scale in centimeters by using the conversion factors given below. Round your answers to the nearest tenth of a centimeter. An example is given for each property.

Property

Conversion Factor

Example

(For Hydrogen)

Atomic radius

1 cm = 30 pm

32 pm x 1 cm = 1.07 cm (1.1 cm)

30 pm

Ionization Energy

1 cm = 400 kJ

1312 kJ x 1 cm = 3.28 cm (3.3 cm)
400 kJ
Electronegativity

1 cm = 0.8 unit

2.2 units x 1 cm = 2.75 cm (2.8 cm)
0.8 unit

3. Use the diagram of the well plate provided below to plan the placement of the elements. Your well plate should be oriented to correlate with the elements of the periodic table. Row 1 represents the first period, with well H1 as Hydrogen and well A1 as Helium. Row 2 represents the second period, with well H2 as Lithium and well A2 as Neon. Rows 3 and 4 contain the elements in periods 3 and 4, omitting the transition elements.

Write the symbols for the elements in the circles.

image3.png

4. Select colored straws to represent one of the three properties.

5. Place the well plate template with tape onto the bottom of the plate. Wrap the plastic wrap over the top of the plate. Make sure it is secure on the bottom and is tight across the top of the plate.

6. Carefully measure and cut a piece of straw for each element. Following the diagram you completed in Procedure 3, insert each piece into the plastic wrap.

7. Repeat steps 5 and 6 for each of the remaining two properties.

Analysis

1. Examine your tray. How do the properties change as you look from top to bottom within a group or family?

Atomic radius

Ionization energy

Electronegativity

2. As you look from left to right across the periodic table, how do the properties change?

Atomic radius

Ionization energy

Electronegativity

3. Write the electron configuration for the following alkali metals (Group 1).

Li

Na

K

In what way are the electron configurations for group 1 similar?

How do the electron configurations differ as you move down group 1?

4. Write the electron configuration for the elements in period 2, from Li to Ne.

Li

Be

B

C

N

O

F

Ne

What do all the electron configurations above have in common?

How do these electron configurations differ? How does the number of protons differ?

5. In terms of electron configuration, explain the trend in atomic radius.

Down a group

Across the period from left to right

6. In terms of electron configuration, explain the trend in ionization energy.

Down a group

Across the period from left to right

7. In terms of electron configuration, explain the trend in electronegativity.

Down a group

Across the period from left to right

8. Look at your model again. Why do you think we say that the properties of the elements are “periodic”?

9. On the diagram of the periodic table below, draw and label arrows that show the direction in which the three properties (atomic radius, ionization energy, and electronegativity) increase.

image1.png

10. Some of the elements show exceptions to the trends. Look at your model and select an element that seems to have an unusual value for one of these properties. Try to explain why this happens by writing the electron configuration for this element and looking for a definite change from the element before it.

11. Write a paragraph explaining why atomic radius, electronegativity, and ionization energy show periodic trends.

PROPERTIES OF REPRESENTATIVE ELEMENTS

Element

Atomic number

Atomic radius

(pm)

Straw

Length

(cm)

Ionization Energy

(kJ/mol)

Straw

Length (cm)

Electronegativity
(units)

Straw

length (cm)

H

1

32

1312

2.2

He

2

50

2372

-

Li

3

155

520

1.0

Be

4

112

900

1.6

B

5

98

801

2.0

C

6

91

1086

2.5

N

7

92

1402

3.0

O

8

73

1314

3.5

F

9

72

1681

4.0

Ne

10

71

2081

-

Na

11

190

496

0.9

Mg

12

160

738

1.3

Al

13

143

578

1.6

Si

14

132

786

1.9

P

15

128

1012

2.2

S

16

127

1000

2.6

Cl

17

99

1251

3.2

Ar

18

98

1520

-

K

19

235

419

0.8

Ca

20

197

590

1.0

Ga

31

141

579

1.4

Ge

32

137

762

2.0

As

33

139

944

2.2

Se

34

140

941

2.5

Br

35

114

1140

3.0

Kr

36

112

1351

-

image4.jpg

PRE-LAB: PERIODIC TRENDS

1. Which groups of the periodic table contain the “representative elements”?

Why do you think these elements are called “representative”?

2. What is a periodic trend?

3. Consult a chemistry textbook to find the definitions for the following properties, then restate the definition in your own words.

Atomic radius

Ionization energy

Electronegativity

4. Read the procedure for this activity. What is the purpose for including drinking straws in the materials list?

5. Follow the directions in Procedure Step 2 to calculate the straw length needed to represent:

The atomic radius of oxygen

The ionization energy of neon

The electronegativity of arsenic

© 2010 Connections Education LLC. All rights reserved.

Homework is Completed By:

Writer Writer Name Amount Client Comments & Rating
Instant Homework Helper

ONLINE

Instant Homework Helper

$36

She helped me in last minute in a very reasonable price. She is a lifesaver, I got A+ grade in my homework, I will surely hire her again for my next assignments, Thumbs Up!

Order & Get This Solution Within 3 Hours in $25/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 3 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 6 Hours in $20/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 6 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 12 Hours in $15/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 12 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

6 writers have sent their proposals to do this homework:

Buy Coursework Help
Quality Homework Helper
Ideas & Innovations
Writer Writer Name Offer Chat
Buy Coursework Help

ONLINE

Buy Coursework Help

Hi dear, I am ready to do your homework in a reasonable price.

$62 Chat With Writer
Quality Homework Helper

ONLINE

Quality Homework Helper

Hi dear, I am ready to do your homework in a reasonable price.

$62 Chat With Writer
Ideas & Innovations

ONLINE

Ideas & Innovations

Hi, Hope you are doing well. I can do this easily because I have several experiences to write articles on different web sites, creative content for several blogs & also SEO writing. Even I have written many kindle ebooks, Being a creative writer, I think I am the most eligible person for your Ghostwriting project. So lets make no longer delay & start chatting immediately.

$60 Chat With Writer

Let our expert academic writers to help you in achieving a+ grades in your homework, assignment, quiz or exam.

Similar Homework Questions

Guardian angel bus routes - When in the cell cycle does replication occur - Emerging enterprise network applications research paper - Gaia cs umass edu wireshark labs - Just walk on by brent staples multiple choice answers - Smoke alarm compliance certificate template qld - Which of the following are requirements of a relational database - Virtual lab software engineering - Mental health exam 2 rasmussen - Clark rubber rockhampton opening hours - Aasb 116 property plant and equipment - Understanding variation is important because variation - Exploratory descriptive explanatory or evaluative research - Bowen family systems theory powerpoint - Basic moves lesson plans - Is hank hill autistic - Compare and contrast the three sociological perspectives - Negotiation readings exercises and cases - A gantt chart can be used to track informal communication paths. - An Inclusive Guide to Write an Informative Essay - Rene magritte egg and bird - What benefits do wikis provide to companies? - Boral concrete price per m3 - Khufu when was he born - A strategy of diversifying into unrelated businesses - Portfolio Assignment: The Role of the Nurse Informaticist in Systems Development and Implementation,NURS 5051/NURS 6051: Transforming Nursing and Healthcare Through Technology - Mandurah caravan park map - Demolition control precinct brisbane - Soap opera triangle problem solving answers - The author to her book anne bradstreet - Collimation error two peg test - Communication Managerial Applications - Assignment - Abiotic factors in the rainforest - 4.26 lab brute force equation solver - Literature Review - Business ethics - Elementary differential equations and boundary value problems eleventh edition - Aristotle nicomachean ethics translated by terence irwin pdf - Yo yo ma necessary edges summary - Toyota business level strategy - Special Education Videos - An effective counselor maintains that - Anthropology - Ki na2s2o3 k2s2o8 starch - Lone star college transcript - Gai tronics auteldac 5 - Propose a nursing informatics project for your organization - Elementary Stastics - Should phones be banned in school essay - Module 09 Discussion - Lasik Surgery - Periodic table labeled groups - Permutations and combinations hsc questions - How to recover from emergency loan capsim - How to cite oral presentation - Bird with long legs - United states corporation agents inc legalzoom - Bailey 4m extension ladder - Hedda gabler script online - Three most important rules of media buying - Franz roh magical realism - Three major types of governmentsinging in the rain characters - Thirty percent of all dog owners poop scoop - POM - Physical Security Research Paper - Case 9C Lakeside Inn - Intercultural communication process model dersky 2011 - Spelling connections 7 answers - Employee motivation project report doc - Intro to Public Administration - Burning a book poem pdf - To kill a mockingbird chapter 26 questions - MBA Discussion Homework - Webassign college algebra answer key - Abn of hesta super fund - Shadow health neurological assessment documentation - Energy rich molecule that powers all cellular activities - Pretend you are consultant for Netflix. you are to conduct presentation to upper management - Romeo and juliet newspaper article project - Adjectives to describe cake - Response to Classmates Discussions - New novel complex decisions having no proven answers are - Wileyplus brief exercise 4 6 - Use the following cell phone airport data - Access control advantages and disadvantages - Aaron deanne and keon - Crank nicolson method calculator - Franklin and higginbotham from slavery to freedom pdf - Discussion Post - Word chapter 2 formatting and customizing documents - Mastering skimming will improve your reading speed and comprehension - Sci 207 week 3 lab report - Peregrine test questions - How to calculate total connected load - How to build bridges with friends - Mckenna hall notre dame - Refer to the real estate data which reports - John henrik clarke a great and mighty walk essay - Philosophy Paper 1 - What Does It Mean to be a Philosopher? - How does lewis change in cosi