Homework

Homework

Page 158, questions 1-6

Homework1. Describe the development of the modern periodic table. Include contributions made by Newlands, Mendeleev, and Moseley.

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Newlands

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Newlands showed that properties of elements repeat in a periodic way.

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Mendeleev and Meyer

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Mendeleev and Meyer showed a relationship between atomic mass and elemental properties.

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Moseley

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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.

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HomeworkGroups (families)

HomeworkGroups (families)

HomeworkPeriods

HomeworkPeriods

HomeworkMetals

HomeworkMetals

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.

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I

HomeworkF

Cl

Br

I

At

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Ba

HomeworkBe

Mg

Ca

Sr

Ba

Ra

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Fe

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.

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