chem class(2may)

ELEMENTS IN A PERIOD

PERIOD 3Naughty Man And Silly People Should Consume A lot of Kentucky Combo

WRITE THE ELECTRON ARRANGEMENT OF PERIOD 3

2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8

2.8.1 2.8.4 2.8.5 2.8.6 2.8.7 2.8.82.8.2 2.8.3

2.8.8.1 2.8.8.2

1 2

Group 1

Group2

Group 13

Group 14

Group 15

Group 16

Group 17

Group 18

Period 1

Period 2

Period 3

Period 4

1 2

3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18

19 20

PERIOD 3

ACROSS THE PERIOD 3…

1. Atomic size no.of proton in nucleus ↑ positive charge of nucleus ↑ force of attraction of nucleus on the electrons ↑2. Metal → metalloid → non-metal3. Conductivity .4. Electronegativity The atomic size ↓ Positive charge In nucleus ↑ The atom will easily accept electrons to achieve

octet electron arrangement.

PROPERTIES Metal → metalloid → non-metal Oxide: basic → amphoteric → acidic

Base

acid

amphoteric

Each oxide will have

2 reactions

Metal oxide (basic oxide) With water With acid

Non- Metal (acidic oxide) With water With alkali

AMPHOTERIC OXIDE

With acid With alkali

TRANSITION METALS

EXAMPLE OF TRANSITION METALS

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Sc Ti V Cr Mn Fe Co Ni Cu Znrou

THE PHYSICAL PROPERTIES OF TRANSITION METALS.

Shiny surfaces Ductile and Malleable High melting point and boiling point High density Good conductor of heat and electricity.

PROPERTIES OF TRANSITION METALS

COLOR OF TRANSITION METALS

Fe3+

Fe2+

Cu2+

Ni2+

USES OF TRANSITIONS METALS

1 2

3

4

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QUESTION 1: List all the elements in Group 3.

Ans: Na, Mg, Al, Si, P, S, Cl, Ar

QUESTION 2: Describe the physical properties across

the Period. Ans: The atomic size decreases.(no.of proton

in nucleus ↑， positive charge of nucleus ↑， force of attraction of nucleus on the electrons ↑)

Metal → metalloid → non-metal Conductivity decreases.

QUESTIONS 3 Describe the electronegativity of the

elements across the period 3.

Ans: Electronegativity ↑ The atomic size ↓ Positive charge In nucleus ↑ The atom will easily accept electrons to

achieve octet electron arrangement.

QUESTION 4: State the oxide properties of the

elements across the period 3.

Ans: Oxide: basic → amphoteric → acidic

QUESTION 5: Metal oxides react with _______ to form

salt and water.

Ans: acid

QUESTION 6: Transition elements also called

as____________.

Ans: Transition metals

QUESTION 8: One of the properties of transition

metals is form ions which are colored. What is the color of iron(II) and iron (II)?

Ans: Iron(II) – green Iron(III) - brown

QUESTION 7: Describe the physical properties of

transition metals.

Ans: Shiny surfaces Ductile and Malleable High melting point and boiling point High density Good conductor of heat and electricity.

QUESTION 9: Transition metals can acts as catalysts

in manufacturing the margarine. What is the transition metals used?

Ans: Nickel

SUMMARY

Period 3 Transition metals

uses

Special properties

Physical

Changes and reaction in oxide

physical