Homework
Page 158, questions 1-6
Homework1. Describe the development of the modern periodic table. Include contributions made by Newlands, Mendeleev, and Moseley.
Homework
Newlands showed that properties of elements repeat in a periodic way.
Homework
Mendeleev and Meyer
Homework
Mendeleev and Meyer showed a relationship between atomic mass and elemental properties.
Homework
Moseley organized elements by atomic number instead of atomic mass.
Homework2. Sketch a simplified version of the periodic table and indicate the location of groups, periods, metals, nonmetals, and metalloids.
HomeworkGroups (families)
HomeworkGroups (families)
HomeworkNonmetals
HomeworkNonmetals
HomeworkMetalloids
HomeworkMetalloids
Homework3. Describe the general characteristics of metals, nonmetals, and metalloids.
HomeworkMetals:
•Shiny
•Ductile
•Malleable
•Conduct electricity
•Conduct heat.
HomeworkNonmetals:
•Dull
•Brittle
•Poor conductors of electricity
•Poor conductors of heat.
HomeworkMetalloids:
•Properties midway between metals and nonmetals.
HomeworkHalogens:
•Group 17
•Highly reactive
HomeworkNoble gasses:
•Group 8A
•Nonreactive
Homework4. Identify each of the following as a representative element or a transition element.
HomeworkRepresentative elements•Groups designated with “A”
•Wide range of properties.
HomeworkRepresentative elements
HomeworkTransition elements•Groups designated with “B”
HomeworkTransition elements
Homeworka. Lithium (Li)
b. Platinum (Pt)
c. Promethium (Pm)
d. Carbon (C)
Homeworka. Lithium (Li) rep.
b. Platinum (Pt)
c. Promethium (Pm)
d. Carbon (C)
Homeworka. Lithium (Li) rep.
b. Platinum (Pt) trans.
c. Promethium (Pm)
d. Carbon (C)
Homeworka. Lithium (Li) rep.
b. Platinum (Pt) trans.
c. Promethium (Pm) trans.
d. Carbon (C)
Homeworka. Lithium (Li) rep.
b. Platinum (Pt) trans.
c. Promethium (Pm) trans.
d. Carbon (C) rep.
Homework5. For each of the given elements, list two other elements with similar properties.
HomeworkF
Cl
Br
I
At
HomeworkBe
Mg
Ca
Sr
Ba
Ra
Homework
Fe
Ru
Os
Hs
Homework6. An unknown element has chemical behavior similar to that of silicon (Si) and lead (Pb).
The unknown element has a mass greater than that of sulfur (S), but less than that of cadmium (Cd).
Use the periodic table to determine the identity of the unknown element.